Powered by Deep Web Technologies
Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Ground Penetrating Imaging Radar Phase II  

Science Conference Proceedings (OSTI)

EPRI project "Ground Penetrating Imaging Radar Phase II," also called the "GPiR Project," started in August 1998 at Schlumberger-Doll Research, a division of Schlumberger Technology Corporation. Its goal was to determine if modern ground-penetrating radar (GPR) could make three-dimensional (3D) images of buried utility lines accurate and detailed enough to help utility companies better manage their underground infrastructure. Work began with a comparison of commercial and prototype GPR systems in the lab...

2001-06-20T23:59:59.000Z

2

Ground penetrating radar technique to locate coal mining related features: case studies in Texas  

E-Print Network (OSTI)

The goal of this research project is to identify the efficacy of the ground penetrating radar (GPR) technique in locating underground coal mine related subsidence features at Malakoff and Bastrop, Texas. The work at Malakoff has been done in collaboration with the Railroad Commission of Texas (RRC). RRC has been carrying out reclamation of abandoned underground coal mines at Malakoff since the early 1990Â?s. The history of the specific mining operations (at Malakoff and Bastrop) that took place in the early 1900Â?s has been difficult to ascertain; therefore, the use of a geophysical techniques like ground penetrating radar to identify hidden voids and potential subsidence features is vital for future reclamation process. Some of the underground mine workings at the field site have collapsed over time affecting the topography by creating sinkholes. GPR data, employing 25 MHz, 50 MHz and 100 MHz frequency antennae, have been collected in common offset patterns and azimuthal pattern. GPR data indicate the mine tunnels possibly connecting existing sinkholes by radargram hyperbolae that correspond with mine openings observed visually or during reclamation. This study also denotes the importance of understanding the variable physical properties of the stratigraphy, which could lead to false alarms by misinterpretation of the radar signals. Natural and man-made above-ground structures cause obstructions in data collection, and hence an optimal design is required for each survey. RRC successfully ground-truthed the data during its reclamation process. In turn, the acquired geophysical data helped to guide the reclamation. At Bastrop, GPR data along with historical documentation led to the conclusion that coal mining did exist in this region but is not a major concern to the immediate stability and safety of the field site. It can be concluded from both the studies that the GPR technique identifies anomalous shafts/tunnels possibly connecting potential failure.

Save, Neelambari R

2004-12-01T23:59:59.000Z

3

Saturated hydraulic conductivity determined by on ground mono-offset Ground-Penetrating Radar inside a single ring infiltrometer  

E-Print Network (OSTI)

In this study we show how to use GPR data acquired along the infiltration of water inside a single ring infiltrometer to inverse the saturated hydraulic conductivity. We used Hydrus-1D to simulate the water infiltration. We generated water content profiles at each time step of infiltration, based on a particular value of the saturated hydraulic conductivity, knowing the other van Genuchten parameters. Water content profiles were converted to dielectric permittivity profiles using the Complex Refractive Index Method relation. We then used the GprMax suite of programs to generate radargrams and to follow the wetting front using arrival time of electromagnetic waves recorded by a Ground-Penetrating Radar (GPR). Theoretically, the 1D time convolution between reflectivity and GPR signal at any infiltration time step is related to the peak of the reflected amplitude recorded in the corresponding trace in the radargram. We used this relation ship to invert the saturated hydraulic conductivity for constant and fallin...

Léger, Emmanuel; Coquet, Yves

2013-01-01T23:59:59.000Z

4

Material Property Estimation for Direct Detection of DNAPL using Integrated Ground-Penetrating Radar Velocity, Imaging and Attribute Analysis  

SciTech Connect

The focus of this project is direct detection of DNAPL's specifically chlorinated solvents, via material property estimation from multi-fold surface ground-penetrating radar (GPR) data. We combine state-of-the-art GPR processing methodology with quantitative attribute analysis and material property estimation to determine the location and extent of residual and/or pooled DNAPL in both the vadose and saturated zones. An important byproduct of our research is state-of-the-art imaging which allows us to pinpoint attribute anomalies, characterize stratigraphy, identify fracture zones, and locate buried objects.

John H. Bradford; Stephen Holbrook; Scott B. Smithson

2004-12-09T23:59:59.000Z

5

Material Property Estimation for Direct Detection of DNAPL using Integrated Ground-Penetrating Radar Velocity, Imaging and Attribute Analysis  

SciTech Connect

The focus of this project is direct detection of DNAPL's specifically chlorinated solvents, via material property estimation from multi-fold surface ground-penetrating radar (GPR) data. We combine state-of-the-art GPR processing methodology with quantitative attribute analysis and material property estimation to determine the location and extent of residual and/or pooled DNAPL in both the vadose and saturated zones. An important byproduct of our research is state-of-the-art imaging which allows us to pinpoint attribute anomalies, characterize stratigraphy, identify fracture zones, and locate buried objects.

John H. Bradford; Stephen Holbrook; Scott B. Smithson

2004-12-09T23:59:59.000Z

6

A validation of ground penetrating radar for reconstructing the internal structure of a rock glacier: Mount Mestas, Colorado, USA  

E-Print Network (OSTI)

Rock glaciers are dynamic landforms and, as such, exhibit interesting and welldeveloped structural features, which translate to surface morphology in the form of ridges and furrows. These distinguishing features have led researchers to study the physics behind the movement and internal deformation of rock glaciers. For years researchers had no access to the internal makeup of rock glaciers. Thus, proposed models and discussion have been based on theoretical concepts of electromagnetic (EM) wave propogation. With the application of ground penetrating radar (GPR) to provide a view of the interior structure of a rock glacier, researchers had “real” data to verify their models. However, no comparison has been made between a GPR profile and an actual cross-section of a rock glacier. The purpose of this thesis is to validate the fidelity of GPR in showing the actual structure of a rock glacier. A trench that was excavated through the toe of a rock glacier on Mount Mestas in south central Colorado provided a view of the actual structure of the landform. The structure in the trench was compared with GPR and EM data. The GPR study was conducted using a PulsEKKOTM 100A subsurface imaging radar with 25, 50, and 100 MHz antennas, to detect dielectric contrasts within the rock glacier. A frequency domain EM34 by Geonics LtdTM was also used to supplement the GPR data by measuring the rock glacier’s conductivity at various depths. This thesis proved, by utilizing statistics, that GPR is a useful tool in visualizing the interior structure of rock glaciers. The 100 MHz antennas clearly show small scale reflection horizons caused by changes in clast orientation and subsurface material composition. These events coincide with structures seen in the trench. Individual clasts greater than 0.375 m were also recognized as point sources in the GPR profiles. Large continuous bedding layers were observed with the 25 and 50 MHz antennas, which reflect the structure seen in the trench. A large scale thrust fault was also located with the GPR. However, this was not visible in the panoramic photograph because the fault occurs below the base of the trench.

Jorgensen, William Revis

2007-05-01T23:59:59.000Z

7

Intergrated 3-D Ground-Penetrating Radar,Outcrop,and Boreholoe Data Applied to Reservoir Characterization and Flow Simulation.  

Science Conference Proceedings (OSTI)

Existing reservoir models are based on 2-D outcrop;3-D aspects are inferred from correlation between wells,and so are inadequately constrained for reservoir simulations. To overcome these deficiencies, we initiated a multidimensional characterization of reservoir analogs in the Cretaceous Ferron Sandstone in Utah.The study was conducted at two sites(Corbula Gulch Coyote Basin); results from both sites are contained in this report. Detailed sedimentary facies maps of cliff faces define the geometry and distribution of potential reservoir flow units, barriers and baffles at the outcrop. High resolution 2-D and 3-D ground penetrating radar(GPR) images extend these reservoir characteristics into 3-D to allow development of realistic 3-D reservoir models. Models use geometric information from the mapping and the GPR data, petrophysical data from surface and cliff-face outcrops, lab analyses of outcrop and core samples, and petrography. The measurements are all integrated into a single coordinate system using GPS and laser mapping of the main sedimentologic features and boundaries. The final step is analysis of results of 3-D fluid flow modeling to demonstrate applicability of our reservoir analog studies to well siting and reservoir engineering for maximization of hydrocarbon production. The main goals of this project are achieved. These are the construction of a deterministic 3-D reservoir analog model from a variety of geophysical and geologic measurements at the field sites, integrating these into comprehensive petrophysical models, and flow simulation through these models. This unique approach represents a significant advance in characterization and use of reservoir analogs. To data,the team has presented five papers at GSA and AAPG meetings produced a technical manual, and completed 15 technical papers. The latter are the main content of this final report. In addition,the project became part of 5 PhD dissertations, 3 MS theses,and two senior undergraduate research projects.

McMechan et al.

2001-08-31T23:59:59.000Z

8

Material Property Estimation for Direct Detections of DNAPL using Integrated Ground-Penetrating Radar Velocity, Imaging and Attribute Analysis  

DOE Green Energy (OSTI)

The focus of our work is direct detection of DNAPLs, specifically chlorinated solvents, via material property estimation from surface ground-penetrating radar (GPR) data. We combine sophisticated GPR processing methodology with quantitative attribute analysis and material property estimation to determine the location and extent of residual and/or pooled DNAPL in both the vadose and saturated zones. An important byproduct of our research is state-of-the-art imaging which allows us to pinpoint attribute anomalies, characterize stratigraphy, identify fracture zones, and locate buried objects. Implementation and verification of these methodologies will be a significant advance in GPR research and in meeting DOE's need for reliable in-situ characterization of DNAPL contamination. Chlorinated solvents have much lower electric permittivity and conductivity than water. An electrical property contrast is induced when solvents displace water in the sediment column resulting in an anomalous GPR signature. To directly identify zones of DNAPL contamination, we focus on three aspects of reflected wave behavior--propagation velocity, frequency dependent attenuation, and amplitude variation with offset (AVO). Velocity analysis provides a direct estimate of electric permittivity, attenuation analysis provides a measure of conductivity, and AVO behavior is used to estimate the permittivity ratio at a reflecting boundary. Areas of anomalously low electric permittivity and conductivity are identified as potential DNAPL rich zones. Preliminary work illustrated significant potential for quantitative direct detection methodologies in identifying shallow DNAPL source zones. It is now necessary to verify these methodologies in a field setting. To this end, the project is field oriented and has three primary objectives: (1) Develop a suite of methodologies for direct detection of DNAPLs from surface GPR data (2) Controlled field verification at well characterized, contaminated sites (3) Exploratory contaminant detection in a field setting to be verified through direct sampling Field experiments are being conducted at the Savannah River and Hanford sites, at five DOD sites (Dover AFB, DE; McClellan AFB, CA; Port Hueneme, CA; Wurtsmith AFB, MI; Hill AFB, UT), at a former refinery site near Cincinnati, Ohio, and at a creosote wood preserving site in Fayetville, NC.

Bradford, John; Smithson, Scott B.; Holbrook, W. Stephen

2004-06-14T23:59:59.000Z

9

Obstacle penetrating dynamic radar imaging system  

DOE Patents (OSTI)

An obstacle penetrating dynamic radar imaging system for the detection, tracking, and imaging of an individual, animal, or object comprising a multiplicity of low power ultra wideband radar units that produce a set of return radar signals from the individual, animal, or object, and a processing system for said set of return radar signals for detection, tracking, and imaging of the individual, animal, or object. The system provides a radar video system for detecting and tracking an individual, animal, or object by producing a set of return radar signals from the individual, animal, or object with a multiplicity of low power ultra wideband radar units, and processing said set of return radar signals for detecting and tracking of the individual, animal, or object.

Romero, Carlos E. (Livermore, CA); Zumstein, James E. (Livermore, CA); Chang, John T. (Danville, CA); Leach, Jr.. Richard R. (Castro Valley, CA)

2006-12-12T23:59:59.000Z

10

A Statistical Approach to Ground Radar-Rainfall Estimation  

Science Conference Proceedings (OSTI)

This paper presents development of a statistical procedure for estimation of ensemble rainfall fields from a combination of ground radar observations and in situ rain gauge measurements. The uncertainty framework characterizes radar-rainfall ...

Alemu Tadesse; Emmanouil N. Anagnostou

2005-11-01T23:59:59.000Z

11

Ultra Wideband 3-D Ground Penetrating Radar  

Jupiter Laser Facility. National Atmospheric Release Advisory Center. Program for Climate Model Diagnosis & Intercomparison. Site 300. Terascale Simulation Facility.

12

Influence of Ground Clutter Contamination on Polarimetric Radar Parameters  

Science Conference Proceedings (OSTI)

The influence of ground clutter contamination on the estimation of polarimetric radar parameters, horizontal reflectivity (Zh), differential reflectivity (Zdr), correlation coefficient (?h?), and differential propagation phase (dp) was examined. ...

Katja Friedrich; Urs Germann; Pierre Tabary

2009-02-01T23:59:59.000Z

13

Use of Ground Clutter to Monitor Polarimetric Radar Calibration  

Science Conference Proceedings (OSTI)

It is suggested that urban ground clutter can have a role in monitoring calibration of reflectivity factor ZH and differential reflectivity ZDR on polarimetric radars. The median and average values of these variables are considered. Analysis of ...

L. Borowska; D. Zrnic

2012-02-01T23:59:59.000Z

14

Ground Based GPR (Ground Penetrating Radar) Buried Hazard ...  

The technology includes a mobile high-performance computing system allowing GPR array sensor data to be processed to form subsurface images which are ...

15

Estimation of Near-Ground Propagation Conditions Using Radar Ground Echo Coverage  

Science Conference Proceedings (OSTI)

The vertical gradient of refractivity (dN/dh) determines the path of the radar beam; namely, the larger the negative values of the refractivity gradient, the more the beam bends toward the ground. The variability of the propagation conditions ...

Shinju Park; Frédéric Fabry

2011-02-01T23:59:59.000Z

16

Weather Radar Ground Clutter. Part II: Real-Time Identification and Filtering  

Science Conference Proceedings (OSTI)

The identification and mitigation of anomalous propagation (AP) and normal propagation (NP) ground clutter is an ongoing problem in radar meteorology. Scatter from ground-clutter targets routinely contaminates radar data and masks weather returns ...

J. C. Hubbert; M. Dixon; S. M. Ellis

2009-07-01T23:59:59.000Z

17

Mesobeta Profiles to Extrapolate Radar Precipitation Measurements above the Alps to the Ground Level  

Science Conference Proceedings (OSTI)

In the Alps, the volume visible by a radar is reduced because of ground clutter, elevated horizon, and earth curvature. This often inhibits a direct view on precipitation close to the ground. When using radar measurements from aloft to estimate ...

Urs Germann; Jürg Joss

2002-05-01T23:59:59.000Z

18

Groundwater penetrating radar and high resolution seismic for locating shallow faults in unconsolidated sediments  

Science Conference Proceedings (OSTI)

Faults in shallow, unconsolidated sediments, particularly in coastal plain settings, are very difficult to discern during subsurface exploration yet have critical impact to groundwater flow, contaminant transport and geotechnical evaluations. This paper presents a case study using cross-over geophysical technologies in an area where shallow faulting is probable and known contamination exists. A comparison is made between Wenner and dipole-dipole resistivity data, ground penetrating radar, and high resolution seismic data. Data from these methods were verified with a cone penetrometer investigation for subsurface lithology and compared to existing monitoring well data. Interpretations from these techniques are compared with actual and theoretical shallow faulting found in the literature. The results of this study suggests that (1) the CPT study, combined with the monitoring well data may suggest that discontinuities in correlatable zones may indicate that faulting is present (2) the addition of the Wenner and dipole-dipole data may further suggest that offset zones exist in the shallow subsurface but not allow specific fault planes or fault stranding to be mapped (3) the high resolution seismic data will image faults to within a few feet of the surface but does not have the resolution to identify the faulting on the scale of our models, however it will suggest locations for upward continuation of faulted zones (4) offset 100 MHz and 200 MHz CMP GPR will image zones and features that may be fault planes and strands similar to our models (5) 300 MHz GPR will image higher resolution features that may suggest the presence of deeper faults and strands, and (6) the combination of all of the tools in this study, particularly the GPR and seismic may allow for the mapping of small scale, shallow faulting in unconsolidated sediments.

Wyatt, D.E. [Westinghouse Savannah River Co., Aiken, SC (United States)]|[South Carolina Univ., Columbia, SC (United States). Earth Sciences and Resources Inst.; Waddell, M.G. [South Carolina Univ., Columbia, SC (United States). Earth Sciences and Resources Inst.; Sexton, B.G. [Microseeps Ltd., Pittsburgh, PA (United States)

1993-12-31T23:59:59.000Z

19

Radar Nowcasting of Cloud-to-Ground Lightning over Houston, Texas  

Science Conference Proceedings (OSTI)

Ten years (1997–2006) of summer (June–August) daytime (1400–0000 UTC) Weather Surveillance Radar-1988 Doppler data for Houston, Texas, were examined to determine the best radar-derived predictors of the first cloud-to-ground lightning flash from a ...

Richard M. Mosier; Courtney Schumacher; Richard E. Orville; Lawrence D. Carey

2011-04-01T23:59:59.000Z

20

The Use of TRMM Precipitation Radar Observations in Determining Ground Radar Calibration Biases  

Science Conference Proceedings (OSTI)

Since the successful launch of the Tropical Rainfall Measuring Mission (TRMM) satellite, measurements of a wide variety of precipitating systems have been obtained with unprecedented detail from the first space-based radar [precipitation radar (...

Emmanouil N. Anagnostou; Carlos A. Morales; Tufa Dinku

2001-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

What Should Be Considered When Simulating Doppler Velocities Measured by Ground-Based Weather Radars?  

Science Conference Proceedings (OSTI)

A sophisticated and flexible simulator of Doppler velocities measured by ground-based weather radars is appended to a high-resolution nonhydrostatic atmospheric model. Sensitivity experiments are conducted by using different configurations for ...

Olivier Caumont; Véronique Ducrocq

2008-08-01T23:59:59.000Z

22

Variational Pseudo-Multiple-Doppler Wind Retrieval in the Vertical Plane for Ground-Based Mobile Radar Data  

Science Conference Proceedings (OSTI)

A variational procedure is developed that utilizes mobile ground-based range–height indicator (RHI) Doppler radar velocity data for the synthesis of two-dimensional, RHI plane wind vectors. The radial component winds are obtained with the radar ...

Christopher C. Weiss; Howard B. Bluestein; Robert Conzemius; Evgeni Fedorovich

2007-07-01T23:59:59.000Z

23

Ocean Surface Wave Measurement Using a Steerable High-Frequency Narrow-Beam Ground Wave Radar  

Science Conference Proceedings (OSTI)

Ground wave radar is emerging as an important tool for routine monitoring of ocean surface conditions and for ship and sea-ice surveillance at ranges well beyond the line-of-sight horizon that limits conventional systems. A major Canadian advance ...

E. W. Gill; M. L. Khandekar; R. K. Howell; J. Walsh

1996-06-01T23:59:59.000Z

24

Radar-Derived Forecasts of Cloud-to-Ground Lightning Over Houston, Texas  

E-Print Network (OSTI)

Ten years (1997 - 2006) of summer (June, July, August) daytime (14 - 00 Z) Weather Surveillance Radar - 1988 Doppler data for Houston, TX were examined to determine the best radar-derived lightning forecasting predictors. Convective cells were tracked using a modified version of the Storm Cell Identification and Tracking (SCIT) algorithm and then correlated to cloud-to-ground lightning data from the National Lightning Detection Network (NLDN). Combinations of three radar reflectivity values (30, 35, and 40 dBZ) at four isothermal levels (-10, -15, -20, and updraft -10 degrees C) and a new radar-derived product, vertically integrated ice (VII), were used to optimize a radar-based lightning forecast algorithm. Forecasts were also delineated by range and the number of times a cell was identified and tracked by the modified SCIT algorithm. This study objectively analyzed 65,399 unique cells, and 1,028,510 to find the best lightning forecast criteria. Results show that using 30 dBZ at the -20 degrees C isotherm on cells within 75 km of the radar that have been tracked for at least 2 consecutive scan produces the best forecasts with a critical success index (CSI) of 0.71. The best VII predictor was 0.734 kg m-2 on cells within 75 km of the radar that have been tracked for at least 2 consecutive scans producing a CSI of 0.68. Results of this study further suggest that combining the radar reflectivity and VII methods can result in a more accurate lightning forecast than either method alone.

Mosier, Richard Matthew

2009-12-01T23:59:59.000Z

25

Doppler Radar Signatures of Developing Thunderstorms and Their Potential to Indicate the Onset of Cloud-to-Ground Lightning  

Science Conference Proceedings (OSTI)

The capability of Doppler weather radars to short-term forecast the initiation of thunderstorms and the onset of cloud-to-ground (CG) lightning is examined. Doppler weather radar data from 28 thunderstorms were analyzed from August 1990 in the ...

Kurt D. Hondl; Michael D. Eilts

1994-08-01T23:59:59.000Z

26

Uncertainty Analysis of the TRMM Ground-Validation Radar-Rainfall Products: Application to the TEFLUN-B Field Campaign  

Science Conference Proceedings (OSTI)

Efforts to validate the Tropical Rainfall Measuring Mission (TRMM) space-based rainfall products have encountered many difficulties and challenges. Of particular concern is the quality of the ground-based radar products—the main tool for ...

Emad Habib; Witold F. Krajewski

2002-05-01T23:59:59.000Z

27

A 5-yr 40-km-Resolution Global Climatology of Superrefraction for Ground-Based Weather Radars  

Science Conference Proceedings (OSTI)

The propagation of electromagnetic waves emitted from ground-based meteorological radars is determined by the stratification of the atmosphere. In extreme superrefractive situations characterized by strong temperature inversions or strong ...

Philippe Lopez

2009-01-01T23:59:59.000Z

28

Comparing EM Models to RCS Measurements for Building-Penetration Radar  

SciTech Connect

For the DARPA VisiBuilding program, SRI International and Lawrence Livermore National Laboratory are using a variety of electromagnetic (EM) simulation codes and measurement techniques to analyze how radar pulses interact with building structures and materials. Of primary interest is how interior wall and corner reflections are delayed, attenuated, and dispersed by the exterior wall materials. In this paper, we compare microwave frequency-domain radar cross section (RCS) chamber measurements of scale models of simple buildings to finite-element and finite-difference full-wave time-domain and ray-tracing models. The ability to accurately reconstruct the building from these models is compared with the reconstruction from chamber measurements. We observe that careful attention to the spatial sampling in the EM models is essential to achieving good reconstruction at the higher frequencies.

Fasenfest, B; Ueberschaer, R

2007-05-18T23:59:59.000Z

29

Ground shock from multiple earth penetrator bursts: Effects for hexagonal weapon arrays  

Science Conference Proceedings (OSTI)

Calculations have been performed with the HULL hydrocode to study ground shock effects for multiple earth penetrator weapon (EPW) bursts in hexagonal-close-packed (HCP) arrays. Several different calculational approaches were used to treat this problem. The first simulations involved two-dimensional (2D) calculations, where the hexagonal cross-section of a unit-cell in an effectively-infinite HCP array was approximated by an inscribed cylinder. Those calculations showed substantial ground shock enhancement below the center of the array. To refine the analysis, 3D unit-cell calculations were done where the actual hexagonal cross-section of the HCP array was modelled. Results of those calculations also suggested that the multiburst array would enhance ground shock effects over those for a single burst of comparable yield. Finally, 3D calculations were run in which an HCP array of seven bursts was modelled explicitly. In addition, the effects of non-simultaneity were investigated. Results of the seven-burst HCP array calculations were consistent with the unit-cell results and, in addition, provided information on the 3D lethal contour produced by such an array.

Kmetyk, L.N.; Yarrington, P.

1990-08-01T23:59:59.000Z

30

Investigating the Potential of Using Radar Echo Reflectivity to Nowcast Cloud-to-Ground Lightning Initiation over Southern Ontario  

Science Conference Proceedings (OSTI)

The potential for using radar echo reflectivity to forecast cloud-to-ground (CG) lightning initiation in the 0–1-h time frame was investigated in southern Ontario, Canada. The main purpose of this investigation was to determine a reflectivity ...

Y. Helen Yang; Patrick King

2010-08-01T23:59:59.000Z

31

Comparison of Dual-Polarization Radar Measurements of Rain with Ground-Based Disdrometer Measurements  

Science Conference Proceedings (OSTI)

Dual-polarization radar measurements of ZH and ZDR, where ZDR = 10 logZH/ZV and ZH, ZV are the radar reflectivity factors for horizontal and vertical polarizations, respectively, are compared with values derived from raindrop-size distributions ...

J. W. F. Goddard; S. M. Cherry; V. N. Bringi

1982-02-01T23:59:59.000Z

32

A Climatological Comparison of Radar and Ground Observations of Hail in Finland  

Science Conference Proceedings (OSTI)

Two approaches to producing a hail climatology for Finland are compared. The first approach is based on 70 yr of hail reports from different sources (newspapers, storm spotters, and other volunteers). The second is derived primarily from radar ...

Elena Saltikoff; Jari-Petteri Tuovinen; Janne Kotro; Timo Kuitunen; Harri Hohti

2010-01-01T23:59:59.000Z

33

Influences of the Local Environment on Supercell Cloud-to-Ground Lightning, Radar Characteristics, and Severe Weather on 2 June 1995  

Science Conference Proceedings (OSTI)

Radar, cloud-to-ground (CG) lightning characteristics, and storm reports were documented for 20 long-lived supercell thunderstorms that occurred during a 6-h period in the west Texas Panhandle on 2–3 June 1995. These thunderstorms occurred in ...

Matthew S. Gilmore; Louis J. Wicker

2002-10-01T23:59:59.000Z

34

A concept and plan for experiments to improve ground shock predictions for the EPW (Earth Penetrator Weapons) program  

SciTech Connect

This document summarizes a concept and plan for providing new experimental data to be used in validating ground shock calculations. The effort was supported by the Earth Penetrator Weapons (EPW) Program. Our main objective is to collect information on certain ground motion phenomena that may be observed in larger-scaled field experiments, but at the same time, exercise greater control over experimental conditions. It is recommended that this work be carried out in concert with other experimental programs, such as the Defense Nuclear Agency's high explosive (HE) test program, so that results are correlative or scalable according to explosive yield. Although we expect there to be some differences, the experimental technique we propose offers a cost-effective means of providing repeatable, reliable ground shock data for a wider variety of media and source configurations than can be obtained with field experiments. The cost of the program, however, would depend on the specific number and design of experiments, and is not included in this presentation. 9 refs., 23 figs.

Thorpe, R.K.; Larson, D.B.; Stout, R.B.; Swift, R.P.; Glenn, H.D.

1988-10-01T23:59:59.000Z

35

Precipitation Estimate Using NEXRAD Ground-Based Radar Images: Validation, Calibration and Spatial Analysis  

Science Conference Proceedings (OSTI)

Precipitation is an important input variable for hydrologic and ecological modeling and analysis. Next Generation Radar (NEXRAD) can provide precipitation products that cover most of the continental United States with a high resolution display of approximately 4 × 4 km2. Two major issues concerning the applications of NEXRAD data are (1) lack of a NEXRAD geo-processing and geo-referencing program and (2) bias correction of NEXRAD estimates. In this chapter, a geographic information system (GIS) based software that can automatically support processing of NEXRAD data for hydrologic and ecological models is presented. Some geostatistical approaches to calibrating NEXRAD data using rain gauge data are introduced, and two case studies on evaluating accuracy of NEXRAD Multisensor Precipitation Estimator (MPE) and calibrating MPE with rain-gauge data are presented. The first case study examines the performance of MPE in mountainous region versus south plains and cold season versus warm season, as well as the effect of sub-grid variability and temporal scale on NEXRAD performance. From the results of the first case study, performance of MPE was found to be influenced by complex terrain, frozen precipitation, sub-grid variability, and temporal scale. Overall, the assessment of MPE indicates the importance of removing bias of the MPE precipitation product before its application, especially in the complex mountainous region. The second case study examines the performance of three MPE calibration methods using rain gauge observations in the Little River Experimental Watershed in Georgia. The comparison results show that no one method can perform better than the others in terms of all evaluation coefficients and for all time steps. For practical estimation of precipitation distribution, implementation of multiple methods to predict spatial precipitation is suggested.

Zhang, Xuesong

2012-12-17T23:59:59.000Z

36

Hail Growth Mechanisms in a Colorado Storm. Part I: Dual-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

Extensive comparisons of dual-wavelength (10 and 3 cm) radar data with observations at the ground and penetration aircraft (T-28) measurements of hail in a Colorado storm show that positive hail signals (10 cm reflectivity factor exceeds that at ...

A. R. Jameson; A. J. Heymsfield

1980-08-01T23:59:59.000Z

37

Elements of a continuous-wave borehole radar. Final report  

DOE Green Energy (OSTI)

The theory is developed for the antenna array for a proposed continuous-wave, ground-penetrating radar for use in a borehole, and field measurements are presented. Accomplishments include the underground measurement of the transmitting beam in the azimuth plane, active azimuth-steering of the transmitting beam, and the development of a range-to-target algorithm. The excellent performance of the antenna array supports the concept of a continuous-wave borehole radar. A field-prototype should be developed for use in both geothermal zones and for the exploration and recovery of oil and gas.

Caffey, T.W.H. [Sandia National Labs., Albuquerque, NM (United States). Geophysical Technology Dept.

1997-08-01T23:59:59.000Z

38

Stereoradar Meteorology: A New Unified Approach to Process Data from Airborne or Ground-Based Meteorological Radars  

Science Conference Proceedings (OSTI)

The concept of stereoradar in meteorology was first proposed by Testud and Amayenc. It consists of radar observations of a precipitation cell from two viewing angles, using an attenuated frequency. The initial inspiration of the technique lays in ...

Ahmed Kabèche; Jacques Testud

1995-08-01T23:59:59.000Z

39

Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Radar Details Activities (0) Areas (0) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Remote Sensing Techniques Exploration Sub Group: Active Sensors Parent Exploration Technique: Active Sensors Information Provided by Technique Lithology: Stratigraphic/Structural: Detect fault and ground movement Hydrological: Can give indications about subsurface geothermal fluid flow Thermal: Dictionary.png Radar: Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. Other definitions:Wikipedia Reegle Introduction RAdio Detection And Ranging (RADAR) is used in a wide variety of applications. In remote sensing applications, the source of the radio waves

40

Ground-Based Radar  

NLE Websites -- All DOE Office Websites (Extended Search)

Measurement Measurement (ARM) Program A Laboratory for the Study of Clouds and Atmospheric Radiation The Atmospheric Radiation Measurement (ARM) Program A Laboratory for the Study of Clouds and Atmospheric Radiation Tom Ackerman Chief Scientist Tom Ackerman Chief Scientist ARM ARM Atmospheric Radiation Measurement Atmospheric Radiation Measurement Why Study Clouds and Radiation? Why Study Clouds and Radiation? * Clouds control the radiation balance of the planet - top of atmosphere (TOA) and surface - Solar reflectivity at TOA and surface transmission - Infrared loss at TOA and surface heating * Cloud feedback processes (how cloud properties change in response to changes in climate forcing) are the most important and least understood component of climate change simulations * Clouds control the radiation balance of the

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Spurious Velocities in Doppler Radar Data Caused by a Moving Antenna Feedhorn  

Science Conference Proceedings (OSTI)

Modern Doppler weather radars use clutter filtering to reduce the strength of ground targets and enhance the detection of meteorological echoes. WSR-88D [NEXRAD (Next Generation Radar) and TDWR (Terminal Doppler Weather Radar)] radars, for ...

Ronald E. Rinehart

1991-12-01T23:59:59.000Z

42

The Kinetic Energy of Hailfalls. Part IV: Patterns of Hailpad and Radar Data  

Science Conference Proceedings (OSTI)

Ground-and radar-measured patterns of hail kinetic energy from eight hailstorms have been compared. The radar patterns were shifted horizontally in such a way that the correlation coefficient between the ground and radar data reaches a maximum. ...

W. Schmid; H. H. Schiesser; A. Waldvogel

1992-10-01T23:59:59.000Z

43

Thunderstorm characteristics of cloud-to-ground lightning at the Kennedy Space Center, Florida: a study of lightning initiation signatures as indicated by Doppler radar  

E-Print Network (OSTI)

A sum-nary of lightning characteristics was developed for the NASA Kennedy Space Center (KSC). From-n a 1989-1996 data set, the spatial patterns, temporal patterns, and first stroke mean peak current were analyzed. Forty five thunderstorms were chosen due to their isolated development over KSC. Forty of the storms representing summer (May through September) airmass thunderstorms and five storms representing winter were examined for their storms-n initiation characteristics. Radar reflectivity echoes at the -10 C,-15 C, and-20 C temperature heights were associated with cloud-to-ground (CG) lightning strike locations from the National Lightning Detection Network. A distinct region of high ground flash densities can be seen over land matching the topography of the KSC coastline. A maximum of values was observed during the summer months for both negative and positive flashes. The absolute i-magnitude of negative peak currents was found to be higher than positive peak currents in Florida. Although thunderstorms can Occur at any time during the day, the diurnal distribution of lightning flashes showed that the afternoon (2000-2200 UTC) was the time of maximum lightning activity. From a time history of radar-echoes, it was found that the 30 dBZ echo detected at the-I 5'C temperature height is the best indicator of the beginning of CG lightning activity. The observed median lag time between this lightning initiation signature and the beginning of CG lightning flashes was 15.5 minutes. Other lightning initiation signatures were also examined at all three temperature heights and did not yield as successful results.

Gremillion, Michael Shane

1998-01-01T23:59:59.000Z

44

Ground-Based Observations and Modeling of the Visibility and Radar Reflectivity in a Radiation Fog Layer  

Science Conference Proceedings (OSTI)

The development of a radiation fog layer at the Cabauw Experimental Site for Atmospheric Research (51.97°N, 4.93°E) on 23 March 2011 was observed with ground-based in situ and remote sensing observations to investigate the relationship between ...

R. Boers; H. Klein Baltink; H. J. Hemink; F. C. Bosveld; M. Moerman

2013-02-01T23:59:59.000Z

45

Definition: Radar | Open Energy Information  

Open Energy Info (EERE)

Radar Radar Jump to: navigation, search Dictionary.png Radar Radar is an active-sensor remote sensing tool used to detect small changes in ground movement at geothermal locations. View on Wikipedia Wikipedia Definition Radar is an object detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio waves or microwaves which bounce off any object in their path. The object returns a tiny part of the wave's energy to a dish or antenna which is usually located at the same site as the transmitter. Radar was secretly developed by several nations before and

46

Comparison of Drop Size Distribution Parameter (D0) and Rain Rate from S-Band Dual-Polarized Ground Radar, TRMM Precipitation Radar (PR), and Combined PR–TMI: Two Events from Kwajalein Atoll  

Science Conference Proceedings (OSTI)

The estimation of the drop size distribution parameter [median volume diameter (D0)] and rain rate (R) from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) as well as from combined PR–TRMM Microwave Imager (TMI) algorithms ...

V. N. Bringi; Gwo-Jong Huang; S. Joseph Munchak; Christian D. Kummerow; David A. Marks; David B. Wolff

2012-11-01T23:59:59.000Z

47

Relationship between Radar-Estimated Precipitation and Synoptic Weather Patterns in the European Alps  

Science Conference Proceedings (OSTI)

A 9-yr (2000–08) analysis of precipitation characteristics for the central and western European Alps has been generated from ground-based operational weather radar data provided by the Swiss radar network. The radar-based precipitation analysis ...

James V. Rudolph; Katja Friedrich; Urs Germann

2011-05-01T23:59:59.000Z

48

RADIAL-BASED NOISE POWER ESTIMATION FOR WEATHER RADARS  

Science Conference Proceedings (OSTI)

A radar antenna intercepts thermal radiation from various sources including the ground, the sun, the sky, precipitation and man-made radiators. In the radar receiver, this external radiation produces noise that constructively adds to the receiver ...

Igor R. Ivi?; Christopher Curtis; Sebastián M. Torres

49

The Rain Profiling Algorithm Applied to Polarimetric Weather Radar  

Science Conference Proceedings (OSTI)

The algorithm developed in this paper for ground-based polarimetric radars is derived from those used for the spaceborne rain radar of TRMM (Tropical Rainfall Measurement Mission)—the so-called rain profiling algorithms. The characteristic of ...

Jacques Testud; Erwan Le Bouar; Estelle Obligis; Mustapha Ali-Mehenni

2000-03-01T23:59:59.000Z

50

Characteristics of Radar-Identified Big Drop Zones in Swiss Hailstorms  

Science Conference Proceedings (OSTI)

The characteristics of the so-called “radar-identified big drop zones” (rBDZ) have been investigated. The study employs radar observations of several thunderstorms and simultaneous microphysical and vertical wind measurements with a penetrating T-...

Albert Waldvogel; Laszlo Klein; Dennis J. Musil; Paul L. Smith

1987-08-01T23:59:59.000Z

51

ARM - Measurement - Radar Doppler  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band (95 GHz) ARM Cloud Radar MMCR : Millimeter Wavelength Cloud Radar RWP : Radar Wind Profiler 50RWP : Radar Wind Profiler (50 MHz) WACR : W-Band (95 GHz) ARM Cloud Radar...

52

Ground-Based Velocity Track Display (GBVTD) Analysis of W-Band Doppler Radar Data in a Tornado near Stockton, Kansas, on 15 May 1999  

Science Conference Proceedings (OSTI)

On 15 May 1999, a storm intercept team from the University of Oklahoma collected high-resolution, W-band Doppler radar data in a tornado near Stockton, Kansas. Thirty-five sector scans were obtained over a period of approximately 10 min, ...

Robin L. Tanamachi; Howard B. Bluestein; Wen-Chau Lee; Michael Bell; Andrew Pazmany

2007-03-01T23:59:59.000Z

53

Penetration equations  

Science Conference Proceedings (OSTI)

In 1967, Sandia National Laboratories published empirical equations to predict penetration into natural earth materials and concrete. Since that time there have been several small changes to the basic equations, and several more additions to the overall technique for predicting penetration into soil, rock, concrete, ice, and frozen soil. The most recent update to the equations was published in 1988, and since that time there have been changes in the equations to better match the expanding data base, especially in concrete penetration. This is a standalone report documenting the latest version of the Young/Sandia penetration equations and related analytical techniques to predict penetration into natural earth materials and concrete. 11 refs., 6 tabs.

Young, C.W. [Applied Research Associates, Inc., Albuquerque, NM (United States)

1997-10-01T23:59:59.000Z

54

Radar Determination of Snowfall Rate and Accumulation  

Science Conference Proceedings (OSTI)

A unique method that provides for relating radar-measured reflectivity factors to snowfall rates at the ground is presented. Data were provided by a CPS-9, 3.2 cm radar from six 1978 Massachusetts snowstorms A best-fit power-law relationship ...

Roland J. Boucher; James G. Wieler

1985-01-01T23:59:59.000Z

55

Helicopter discrimination apparatus for the murine radar  

DOE Patents (OSTI)

A helicopter discrimination apparatus for a radar utilizing doppler filtering to discriminate between a missile and ground clutter. The short duration of the doppler filter pulses which are emitted by helicopter rotor blades are processed to prevent false alarms, thus allowing the radar-protected helicopter to operate in formation with other helicopters while maintaining protection against infra-red-seeking missiles.

Webb, Jr., John G. (Sandia Park, NM); Gray, Roger M. (Dallas, TX)

1977-01-01T23:59:59.000Z

56

Radar Observations of a Major Industrial Fire  

Science Conference Proceedings (OSTI)

On 23 May 1996, a Montreal suburban paint factory containing several hundred thousand gallons of paints, solvents, and other chemicals burned to the ground in a spectacular fire. The smoke plume from the fire was readily detected by three radars ...

R. R. Rogers; W. O. J. Brown

1997-05-01T23:59:59.000Z

57

Climatology of Anomalous Propagation Radar Echoes in a Coastal Area  

Science Conference Proceedings (OSTI)

Anomalous propagation (AP) of ground-based radar beam results in the detection of ground echoes beyond the horizon. One year of data gathered with an S-band meteorological radar located on the coast in southwest France is used to analyze the ...

Frédéric Mesnard; Henri Sauvageot

2010-11-01T23:59:59.000Z

58

Uncertainties in Oceanic Radar Rain Maps at Kwajalein and Implications for Satellite Validation  

Science Conference Proceedings (OSTI)

The Kwajalein, Marshall Islands, Tropical Rainfall Measuring Mission (TRMM) ground validation radar has provided a multiyear three-dimensional radar dataset at an oceanic site. Extensive rain gauge networks are not feasible over the ocean and, ...

Robert A. Houze Jr; Stacy Brodzik; Courtney Schumacher; Sandra E. Yuter; Christopher R. Williams

2004-08-01T23:59:59.000Z

59

Objective Identification of Echoes Due to Anomalous Propagation in Weather Radar Data  

Science Conference Proceedings (OSTI)

Serious contamination of weather radar data can occur in atmospheric conditions that cause anomalous propagation of the radar beam. Excessive downward refraction of the beam may be sufficient to cause ground returns (“anaprop”), which may be ...

J. A. Pamment; B. J. Conway

1998-02-01T23:59:59.000Z

60

High-Resolution, Mobile Doppler Radar Observations of Cyclic Mesocyclogenesis in a Supercell  

Science Conference Proceedings (OSTI)

On 15 May 2003, two ground-based, mobile, Doppler radars scanned a supercell that moved through the Texas Panhandle and cyclically produced mesocyclones. The two radars collected data from the storm during a rapid cyclic mesocyclogenesis stage ...

Michael M. French; Howard B. Bluestein; David C. Dowell; Louis J. Wicker; Matthew R. Kramar; Andrew L. Pazmany

2008-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Gaussian Model Adaptive Processing in Time Domain (GMAP-TD) for Weather Radars  

Science Conference Proceedings (OSTI)

The Gaussian model adaptive processing in the time domain (GMAP-TD) method for ground clutter suppression and signal spectral moment estimation for weather radars is presented. The technique transforms the clutter component of a weather radar ...

Cuong M. Nguyen; V. Chandrasekar

2013-11-01T23:59:59.000Z

62

Simulation and Interpretation of the Phase Data Used by the Radar Refractivity Retrieval Algorithm  

Science Conference Proceedings (OSTI)

The radar refractivity retrieval algorithm applied to radar phase measurements from ground targets can provide high-resolution, near-surface moisture estimates in time and space. The reliability of the retrieval depends on the quality of the ...

Shinju Park; Frédéric Fabry

2010-08-01T23:59:59.000Z

63

Hurricane Structure and Wind Fields from Stereoscopic and Infrared Satellite Observations and Radar Data  

Science Conference Proceedings (OSTI)

Infrared and stereoscopic visible satellite data from synchronized scanning of GOES-East and -West are combined with ground-based radar data for Hurricane Frederic (1979) and time-composited airborne radar for Hurricane Alien (1980) to ...

A. Frederick Hasler; K. Robert Morris

1986-06-01T23:59:59.000Z

64

Two terminal micropower radar sensor  

DOE Patents (OSTI)

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground. 3 figs.

McEwan, T.E.

1995-11-07T23:59:59.000Z

65

Two terminal micropower radar sensor  

SciTech Connect

A simple, low power ultra-wideband radar motion sensor/switch configuration connects a power source and load to ground. The switch is connected to and controlled by the signal output of a radar motion sensor. The power input of the motion sensor is connected to the load through a diode which conducts power to the motion sensor when the switch is open. A storage capacitor or rechargeable battery is connected to the power input of the motion sensor. The storage capacitor or battery is charged when the switch is open and powers the motion sensor when the switch is closed. The motion sensor and switch are connected between the same two terminals between the source/load and ground.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

66

Relationships between Radar Properties at High Elevations and Surface Rain Rate: Potential Use for Spaceborne Rainfall Measurements  

Science Conference Proceedings (OSTI)

Ground-based radar data have been used to investigate the relationship between reflectivity at high elevations and surface rain rates. Such relations are useful for rainfall measurements by spaceborne radars at attenuating wavelength such as the ...

Eyal Amitai

1999-03-01T23:59:59.000Z

67

Subglacial water presence classification from polar radar data  

Science Conference Proceedings (OSTI)

Ground and airborne radar depth-sounding of the Greenland and Antarctic ice sheets have been used for many years to remotely determine characteristics such as ice thickness, subglacial topography, and mass balance of large bodies of ice. Ice coring efforts ... Keywords: Ensemble classification, Machine learning, Pattern recognition, Radar remote sensing, Subglacial water

Christopher M. Gifford; Arvin Agah

2012-06-01T23:59:59.000Z

68

Signal Processing System for the CASA Integrated Project I Radars  

Science Conference Proceedings (OSTI)

This paper describes the waveform design space and signal processing system for dual-polarization Doppler weather radar operating at X band. The performance of the waveforms is presented with ground clutter suppression capability and mitigation ...

Nitin Bharadwaj; V. Chandrasekar; Francesc Junyent

2010-09-01T23:59:59.000Z

69

Objective Tropical Cyclone Center Tracking Using Single-Doppler Radar  

Science Conference Proceedings (OSTI)

This study presents an extension of the ground-based velocity track display (GBVTD)-simplex tropical cyclone (TC) circulation center–finding algorithm to further improve the accuracy and consistency of TC center estimates from single-Doppler radar ...

Michael M. Bell; Wen-Chau Lee

2012-05-01T23:59:59.000Z

70

Feasibility Test of an Airborne Pulse-Doppler Meteorological Radar  

Science Conference Proceedings (OSTI)

A vertically scanning, airborne, pulse-Doppler radar is described. Data processing methods to yield pseudo-dual-Doppler horizontal winds are presented. Results of an intercomparison with a ground-based dual-Doppler network are presented and ...

David P. Jorgensen; Peter H. Hildebrand; Charles L. Frush

1983-05-01T23:59:59.000Z

71

Raindrop Size Distribution and Radar Parameters at Cape Verde  

Science Conference Proceedings (OSTI)

Precipitation measurement using passive or active microwaves from space- or ground-based radar involves hypotheses about the raindrop size distribution (DSD). A universal knowledge of DSD characteristics is needed. A 4-yr dataset collected with a ...

Armand Nzeukou; Henri Sauvageot; Abe Delfin Ochou; Cheikh Mouhamed Fadel Kebe

2004-01-01T23:59:59.000Z

72

Separation of Propagation and Backscattering Effects in Rain for Circular Polarization Diversity S-Band Radars  

Science Conference Proceedings (OSTI)

Because precipitation particles are generally nonspherical, not only will microwave radiation be depolarized when reflected by precipitation, but also the polarization state of the transmitted wave will change as the radar beam penetrates the ...

Enrico Torlaschi; Anthony R. Holt

1993-08-01T23:59:59.000Z

73

Comparisons of Rain Rate and Reflectivity Factor Derived from the TRMM Precipitation Radar and the WSR-88D over the Melbourne, Florida, Site  

Science Conference Proceedings (OSTI)

Validating the results from the spaceborne Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) requires comparisons with well-calibrated ground-based radar measurements. At altitudes near the storm top, where effects of PR signal ...

Liang Liao; Robert Meneghini; Toshio Iguchi

2001-12-01T23:59:59.000Z

74

Three-dimensional subsurface imaging synthetic aperture radar (3D SISAR). Final report, September 22, 1993--September 22, 1996  

SciTech Connect

The concept developed under this applied research and development contract is a novel Ground Penetrating Radar system capable of remotely detecting, analyzing, and mapping buried waste containers from a mobile platform. From the testing and analysis performed to date, the 3-D SISAR has achieved the detection, accurate location, and three-dimensional imaging of buried test objects from a stand-off geometry. Tests have demonstrated that underground objects have been located to within 0.1 meter of their actual position. This work validates that the key elements of the approach are performing as anticipated. The stand-off synthetic aperture radar (SAR) methodology has been demonstrated to be a feasible approach as a remote sensing technique. The radar sensor constructed under this project is providing adequate quality data for imaging, and the matched filters have been demonstrated to provide enhanced target detection. Additional work is on-going in the area of underground propagation and scattering phenomena to provide enhanced depth performance, as the current imaging results have been limited to a few feet of depth underground.

NONE

1998-12-31T23:59:59.000Z

75

A Study of the Error Covariance Matrix of Radar Rainfall Estimates in Stratiform Rain. Part II: Scale Dependence  

Science Conference Proceedings (OSTI)

The contribution of various physical sources of uncertainty affecting radar rainfall estimates at the ground has been recently quantified at a resolution typically used in schemes assimilating rainfall at the ground onto mesoscale models. Here, ...

Marc Berenguer; Isztar Zawadzki

2009-06-01T23:59:59.000Z

76

Lagrangian finite element analysis of the penetration of earth penetrating weapons  

SciTech Connect

Buried targets, such as hardened missile silos, that are resistant to the effects of air blast from above-ground or surface-burst explosions may be vulnerable to the effects of ground motion produced by nearby underground explosions. An earth penetrating weapon (EPW) is being developed to exploit this phenomena. To design the EPW system, loads on the weapon due to the penetration event must be determined. This paper presents the methodology for performing Lagrangian finite-element analysis of the penetration event in two and three dimensions. In order to describe the methodology, results from analyses done for a particular EPW impacting a particular target medium are presented. The results for impacts with nonzero angles of incidence and nonzero angles of attack show the importance of being able to calculate three dimensional penetration loads. 62 figs.

Rosinsky, R.W.

1985-11-22T23:59:59.000Z

77

Real–Time Wind Synthesis from Doppler Radar Observations during the Mesoscale Alpine Programme  

Science Conference Proceedings (OSTI)

A real–time and automated multiple–Doppler analysis method for ground–based radar data, with an emphasis on observations conducted over complex terrain, is presented. It is the result of a joint effort of the radar groups of Centre National de ...

M. Chong; J-F. Georgis; O. Bousquet; S. R. Brodzik; C. Burghart; S. Cosma; U. Germann; V. Gouget; R. A. Houze Jr.; C. N. James; S. Prieur; R. Rotunno; F. Roux; J. Vivekanandan; Z-X. Zeng

2000-12-01T23:59:59.000Z

78

Session: Hard Rock Penetration  

DOE Green Energy (OSTI)

This session at the Geothermal Energy Program Review X: Geothermal Energy and the Utility Market consisted of five presentations: ''Hard Rock Penetration - Summary'' by George P. Tennyson, Jr.; ''Overview - Hard Rock Penetration'' by James C. Dunn; ''An Overview of Acoustic Telemetry'' by Douglas S. Drumheller; ''Lost Circulation Technology Development Status'' by David A. Glowka; ''Downhole Memory-Logging Tools'' by Peter Lysne.

Tennyson, George P. Jr.; Dunn, James C.; Drumheller, Douglas S.; Glowka, David A.; Lysne, Peter

1992-01-01T23:59:59.000Z

79

Synthetic Aperture Radar -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Information Contacts Synthetic Aperture Radar Sandia synthetic aperture radar image of Washington, DC Sandia synthetic aperture radar image of Washington, DC Sandia synthetic...

80

Simulation of the Orographic Influence on Weather Radar Using a Geometric–Optics Approach  

Science Conference Proceedings (OSTI)

A computer code for radar site assessment, including ground clutter, beam occultation, and earth curvature–atmospheric refraction factors, has been developed. The code uses topographic information in the form of a raster Digital Elevation Model, ...

M. Gabella; G. Perona

1998-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

A Framework for the Statistical Analysis of Large Radar and Lightning Datasets: Results from STEPS 2000  

Science Conference Proceedings (OSTI)

A framework for the statistical analysis of large radar and lightning datasets is described and implemented in order to analyze two research questions in atmospheric electricity: storms dominated by positive cloud-to-ground (+CG) lightning and ...

Timothy J. Lang; Steven A. Rutledge

2011-08-01T23:59:59.000Z

82

Real-Time Detection and Filtering of Chaff Clutter from Single-Polarization Doppler Radar Data  

Science Conference Proceedings (OSTI)

In countries with frequent aerial military exercises, chaff particles that are routinely spread by military aircraft represent significant noise sources for ground-based weather radar observation. In this study, a cost-effective procedure is ...

Yong Hyun Kim; Sungshin Kim; Hye-Young Han; Bok-Haeng Heo; Cheol-Hwan You

2013-05-01T23:59:59.000Z

83

An Automated Cloud-Edge Detection Algorithm Using Cloud Physics and Radar Data  

Science Conference Proceedings (OSTI)

An automated cloud-edge detection algorithm was developed and extensively tested. The algorithm uses in situ cloud physics data measured by a research aircraft coupled with ground-based weather radar measurements to determine whether the aircraft ...

Jennifer G. Ward; Francis J. Merceret

2004-05-01T23:59:59.000Z

84

Inside Volcanic Clouds: Remote Sensing of Ash Plumes Using Microwave Weather Radars  

Science Conference Proceedings (OSTI)

Microphysical and dynamical features of volcanic tephra due to Plinian and sub-Plinian eruptions can be quantitatively monitored by using ground-based microwave weather radars. The methodological rationale and unique potential of this remote-sensing ...

Frank S. Marzano; Errico Picciotti; Mario Montopoli; Gianfranco Vulpiani

2013-10-01T23:59:59.000Z

85

A Technique for Detecting a Tropical Cyclone Center Using a Doppler Radar  

Science Conference Proceedings (OSTI)

A ground-based Doppler radar technique is developed for detecting a tropical cyclone center position. Accurate determination of the cyclone center position, based on Doppler velocity measurements, will become essential for the issuance of ...

Vincent T. Wood

1994-10-01T23:59:59.000Z

86

Climatology of High Cloud Dynamics Using Profiling ARM Doppler Radar Observations  

Science Conference Proceedings (OSTI)

Ice cloud properties are influenced by cloud-scale vertical air motion. Dynamical properties of ice clouds can be determined via Doppler measurements from ground-based, profiling cloud radars. Here, the decomposition of the Doppler velocities into ...

Heike Kalesse; Pavlos Kollias

87

The Estimation of Rainfall Parameters Using Spaceborne and Airborne Nadir-Pointing Radars  

Science Conference Proceedings (OSTI)

When pointed toward ground, spaceborne and airborne radars must use several frequencies in order to estimate rainfall parameters. It is now well known, for example, that the differences between specific attenuations at different frequencies ...

A. R. Jameson

1994-02-01T23:59:59.000Z

88

An Example of the Use of Mobile, Doppler Radar Data for Tornado Verification  

Science Conference Proceedings (OSTI)

On 16 May 2003, two ground-based, mobile, Doppler radars scanned a potentially tornadic supercell in the Texas Panhandle intermittently from 0200 to 0330 UTC. The storm likely was tornadic, but because it was dark, visual confirmation of any ...

Michael M. French; Howard B. Bluestein; Louis J. Wicker; David C. Dowell; Matthew R. Kramar

2009-06-01T23:59:59.000Z

89

Radar Beam Occultation Studies Using GIS and DEM Technology: An Example Study of Guam  

Science Conference Proceedings (OSTI)

Geographic information systems (GISs) combined with digital elevation models (DEMs) provide opportunities to evaluate weather radar beam blockage and other ground clutter phenomena. The authors explore this potential using topographic information ...

Paul A. Kucera; Witold F. Krajewski; C. Bryan Young

2004-07-01T23:59:59.000Z

90

A Study of the Error Covariance Matrix of Radar Rainfall Estimates in Stratiform Rain  

Science Conference Proceedings (OSTI)

The contribution of various physical sources of uncertainty affecting radar rainfall estimates at the ground is quantified toward deriving and understanding the error covariance matrix of these estimates. The focus here is on stratiform ...

Marc Berenguer; Isztar Zawadzki

2008-12-01T23:59:59.000Z

91

Rainfall Doppler Velocity Measurements from Spaceborne Radar: Overcoming Nonuniform Beam-Filling Effects  

Science Conference Proceedings (OSTI)

For vertical Doppler velocity measurements of a homogeneous rain field, the standard spectral moment estimation techniques commonly used by ground-based and airborne Doppler rain radars can be readily extended for spaceborne application, provided ...

Simone Tanelli; Eastwood Im; Stephen L. Durden; Luca Facheris; Dino Giuli; Eric A. Smith

2004-01-01T23:59:59.000Z

92

Synthetic Aperture Radar Interferometry  

E-Print Network (OSTI)

Synthetic aperture radar interferometry is an imaging technique for measuring the topography of a surface, its changes over time, and other changes in the detailed characteristics of the surface. By exploiting the phase of the coherent radar signal, interferometry has transformed radar remote sensing from a largely interpretive science to a quantitative tool, with applications in cartography, geodesy, land cover characterization, and natural hazards. This paper reviews the techniques of interferometry, systems and limitations, and applications in a rapidly growing area of science and engineering.

Paul A. Rosen; Scott Hensley; Ian R. Joughin; Fuk K. Li; Søren N. Madsen; Senior Member; Ernesto Rodríguez; Richard M. Goldstein

2000-01-01T23:59:59.000Z

93

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole. 7 figs.

Chang, Hsi-Tien

1987-09-28T23:59:59.000Z

94

Downhole pulse radar  

DOE Patents (OSTI)

A borehole logging tool generates a fast rise-time, short duration, high peak-power radar pulse having broad energy distribution between 30 MHz and 300 MHz through a directional transmitting and receiving antennas having barium titanate in the electromagnetically active region to reduce the wavelength to within an order of magnitude of the diameter of the antenna. Radar returns from geological discontinuities are sampled for transmission uphole.

Chang, Hsi-Tien (Albuquerque, NM)

1989-01-01T23:59:59.000Z

95

Geologic interpretation of space shuttle radar images of Indonesia  

SciTech Connect

The National Aeronautics and Space Administration (NASA) space shuttle mission in November 1981 acquired images of parts of the earth with a synthetic aperture radar system at a wavelength of 23.5 cm (9.3 in.) and spatial resolution of 38 m (125 ft). This report describes the geologic interpretation of 1:250,000-scale images of Irian Jaya and eastern Kalimantan, Indonesia, where the all-weather capability of radar penetrates the persistent cloud cover. The inclined look direction of radar enhances subtle topographic features that may be the expression of geologic structures. On the Indonesian images, the following terrain categories are recognizable for geologic mapping: carbonate, clastic, volcanic, alluvial and coastal, melange, and metamorphic, as well as undifferentiated bedrock. Regional and local geologic structures are well expressed on the images.

Sabing, F.F.

1983-11-01T23:59:59.000Z

96

Radar remote sensing of the lower atmosphere  

E-Print Network (OSTI)

on the observed radar clutter power. Marine ducts and theiron observed radar clutter power. Marine ducts and their

Karimian, Ali

2012-01-01T23:59:59.000Z

97

Doppler Radar Observations of Dust Devils in Texas  

Science Conference Proceedings (OSTI)

Analyses of a dust-devil dataset collected in northwest Texas are presented. The data were collected just above the ground at close range with a mobile, W-band (3-mm wavelength) Doppler radar having an azimuthal (radial) resolution of 3–5 m (30 m)...

Howard B. Bluestein; Christopher C. Weiss; Andrew L. Pazmany

2004-01-01T23:59:59.000Z

98

Doppler Radar Observations of Mammatus  

Science Conference Proceedings (OSTI)

Observations of mammatus-like cloud features associated with a convective rain shower were obtained using a vertically pointing 8-mm-wavelength Doppler radar. The radar's excellent sensitivity and resolution allowed even very weak, finescale ...

Brooks E. Martner

1995-10-01T23:59:59.000Z

99

A Physically Based Radar Simulator  

Science Conference Proceedings (OSTI)

There is a growing use of multiparameter radars for observation of the atmosphere and, in particular, for remote sensing of rain. Radar systems have the undeniable advantage of being able to monitor very large areas with a single installation in ...

Carlo Capsoni; Michele D’Amico

1998-04-01T23:59:59.000Z

100

A High Resolution Hydrometer Phase Classifier Based on Analysis of Cloud Radar Doppler Spectra.  

SciTech Connect

The lifecycle and radiative properties of clouds are highly sensitive to the phase of their hydrometeors (i.e., liquid or ice). Knowledge of cloud phase is essential for specifying the optical properties of clouds, or else, large errors can be introduced in the calculation of the cloud radiative fluxes. Current parameterizations of cloud water partition in liquid and ice based on temperature are characterized by large uncertainty (Curry et al., 1996; Hobbs and Rangno, 1998; Intriery et al., 2002). This is particularly important in high geographical latitudes and temperature ranges where both liquid droplets and ice crystal phases can exist (mixed-phase cloud). The mixture of phases has a large effect on cloud radiative properties, and the parameterization of mixed-phase clouds has a large impact on climate simulations (e.g., Gregory and Morris, 1996). Furthermore, the presence of both ice and liquid affects the macroscopic properties of clouds, including their propensity to precipitate. Despite their importance, mixed-phase clouds are severely understudied compared to the arguably simpler single-phase clouds. In-situ measurements in mixed-phase clouds are hindered due to aircraft icing, difficulties distinguishing hydrometeor phase, and discrepancies in methods for deriving physical quantities (Wendisch et al. 1996, Lawson et al. 2001). Satellite-based retrievals of cloud phase in high latitudes are often hindered by the highly reflecting ice-covered ground and persistent temperature inversions. From the ground, the retrieval of mixed-phase cloud properties has been the subject of extensive research over the past 20 years using polarization lidars (e.g., Sassen et al. 1990), dual radar wavelengths (e.g., Gosset and Sauvageot 1992; Sekelsky and McIntosh, 1996), and recently radar Doppler spectra (Shupe et al. 2004). Millimeter-wavelength radars have substantially improved our ability to observe non-precipitating clouds (Kollias et al., 2007) due to their excellent sensitivity that enables the detection of thin cloud layers and their ability to penetrate several non-precipitating cloud layers. However, in mixed-phase clouds conditions, the observed Doppler moments are dominated by the highly reflecting ice crystals and thus can not be used to identify the cloud phase. This limits our ability to identify the spatial distribution of cloud phase and our ability to identify the conditions under which mixed-phase clouds form.

Luke,E.; Kollias, P.

2007-08-06T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

ARM - Measurement - Radar polarization  

NLE Websites -- All DOE Office Websites (Extended Search)

polarization polarization ARM Data Discovery Browse Data Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Measurement : Radar polarization The temporal and geometric behavior of the electric field vector of an electromagnetic wave transmitted or received by a radar system, e.g. elliptical polarization, differential reflectivity, phase shift, co-polar correlation coefficient, linear depolarization ratio. Categories Cloud Properties Instruments The above measurement is considered scientifically relevant for the following instruments. Refer to the datastream (netcdf) file headers of each instrument for a list of all available measurements, including those recorded for diagnostic or quality assurance purposes. ARM Instruments CSAPR : C-Band ARM Precipitation Radar

102

A Comparison of Radar Reflectivity Estimates of Rainfall from Collocated Radars  

Science Conference Proceedings (OSTI)

Radar reflectivity–based rainfall estimates from collocated radars are examined. The usual large storm-to-storm variations in radar bias and high correlation between radar estimates and rain gauge observations are found. For three storms in ...

Edward A. Brandes; J. Vivekanandan; James W. Wilson

1999-09-01T23:59:59.000Z

103

On the Use of Doppler Radar–Derived Wind Fields to Diagnose the Secondary Circulations of Tornadoes  

Science Conference Proceedings (OSTI)

A number of studies in recent years have used wind fields derived from portable Doppler radars in combination with the ground-based velocity track display (GBVTD) technique to diagnose the primary (tangential) and secondary (radial and vertical) ...

David S. Nolan

2013-04-01T23:59:59.000Z

104

A Climatology of Disdrometer Measurements of Rainfall in Finland over Five Years with Implications for Global Radar Observations  

Science Conference Proceedings (OSTI)

To improve the understanding of high-latitude rain microphysics and its implications for the remote sensing of rainfall by ground-based and spaceborne radars, raindrop size measurements have been analyzed that were collected over five years with a ...

Jussi Leinonen; Dmitri Moisseev; Matti Leskinen; Walter A. Petersen

2012-02-01T23:59:59.000Z

105

An Airborne Profiling Radar Study of the Impact of Glaciogenic Cloud Seeding on Snowfall from Winter Orographic Clouds  

Science Conference Proceedings (OSTI)

Data from an airborne vertically pointing millimeter-wave Doppler radar are used to study the cloud microphysical effect of glaciogenic seeding of cold-season orographic clouds. Fixed flight tracks were flown downstream of ground-based silver ...

Bart Geerts; Qun Miao; Yang Yang; Roy Rasmussen; Daniel Breed

2010-10-01T23:59:59.000Z

106

Coincident In Situ and W-Band Radar Measurements of Drop Size Distribution in a Marine Stratus Cloud and Drizzle  

Science Conference Proceedings (OSTI)

Investigation of precipitation formation requires measurements of the drop size distribution in a cloud. These measurements have usually been made using ground-based radar systems or aircraft in situ probes. Difficulties encountered in practice ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; S. Haimov; R. Kelly; G. Vali

1999-05-01T23:59:59.000Z

107

Use of Three-Dimensional Reflectivity Structure for Automated Detection and Removal of Nonprecipitating Echoes in Radar Data  

Science Conference Proceedings (OSTI)

This study aims at assessing the potential of anomalous propagation conditions to occur, reviews past attempts to mitigate ground clutter contamination of radar data resulting from anomalous signal propagation, and presents a new algorithm for ...

Matthias Steiner; James A. Smith

2002-05-01T23:59:59.000Z

108

Body of Evidence: New Fast, Reliable Method to Detect ...  

Science Conference Proceedings (OSTI)

... decomposing cadaver. Typically, cadaver-sniffing dogs or ground penetrating radar are used to detect clandestine gravesites. But ...

2013-05-14T23:59:59.000Z

109

A model for forming airborne synthetic aperture radar images of underground targets  

SciTech Connect

Synthetic Aperture Radar (SAR) from an airborne platform has been proposed for imaging targets beneath the earth`s surface. The propagation of the radar`s energy within the ground, however, is much different than in the earth`s atmosphere. The result is signal refraction, echo delay, propagation losses, dispersion, and volumetric scattering. These all combine to make SAR image formation from an airborne platform much more challenging than a surface imaging counterpart. This report treats the ground as a lossy dispersive half-space, and presents a model for the radar echo based on measurable parameters. The model is then used to explore various imaging schemes, and image properties. Dynamic range is discussed, as is the impact of loss on dynamic range. Modified window functions are proposed to mitigate effects of sidelobes of shallow targets overwhelming deeper targets.

Doerry, A.W.

1994-01-01T23:59:59.000Z

110

Radar transponder apparatus and signal processing technique  

DOE Patents (OSTI)

An active, phase-coded, time-grating transponder and a synthetic-aperture radar (SAR) and signal processor means, in combination, allow the recognition and location of the transponder (tag) in the SAR image and allow communication of information messages from the transponder to the SAR. The SAR is an illuminating radar having special processing modifications in an image-formation processor to receive an echo from a remote transponder, after the transponder receives and retransmits the SAR illuminations, and to enhance tile transponder`s echo relative to surrounding ground clutter by recognizing special transponder modulations from phase-shifted from the transponder retransmissions. The remote radio-frequency tag also transmits information to the SAR through a single antenna that also serves to receive the SAR illuminations. Unique tag-modulation and SAR signal processing techniques, in combination, allow the detection and precise geographical location of the tag, through the reduction of interfering signals from ground clutter, and allow communication of environmental and status information from said tag to be communicated to said SAR.

Axline, R.M. Jr.; Sloan, G.R.; Spalding, R.E.

1994-12-31T23:59:59.000Z

111

The Operational Weather Radar Network in Europe  

Science Conference Proceedings (OSTI)

The operational weather radar network in Europe covers more than 30 countries and contains more than 200 weather radars. The radar network is heterogeneous in hardware, signal processing, transmit/receive frequency, and scanning strategy, thus making it ...

Asko Huuskonen; Elena Saltikoff; Iwan Holleman

112

Tornado Damage Estimation Using Polarimetric Radar  

Science Conference Proceedings (OSTI)

This study investigates the use of tornadic debris signature (TDS) parameters to estimate tornado damage severity using Norman, Oklahoma (KOUN), polarimetric radar data (polarimetric version of the Weather Surveillance Radar-1988 Doppler radar). ...

David J. Bodine; Matthew R. Kumjian; Robert D. Palmer; Pamela L. Heinselman; Alexander V. Ryzhkov

2013-02-01T23:59:59.000Z

113

An Innovative Transponder-Based Interferometric Radar for Vibration Measurements  

SciTech Connect

Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of several points of a structure. This technique in the last couple of years has been applied to different types of structures, such as bridges, towers and chimneys. This paper presents a prototype system developed by IDS, originally aimed at measuring the structural vibrations of helicopter rotor blades, based on an interferometric technique and constituted by combination of a radar sensor and a series of transponders installed on the target structure. The main advantages of this solution with respect to conventional interferometric radars, are related to the increased spatial resolution of the system, provided by the possibility to discriminate different transponders installed within the same resolution cell of the radar sensor, and to the reduction of the ambient noise (e.g. multi-path) on the radar measurement. The first feature allows the use of the microwave technology even on target areas with limited dimensions, such as industrial facilities, while the second aspect may extend the use of radar interferometric systems to complex scenarios, where multi-reflections are expected due to the presence of natural targets with high reflectivity to the radar signal. In the paper, the system and its major characteristics are first described; subsequently, application to the measurement of ambient vibration response of a lab set-up is summarized. Then the data acquired on a rotating mock-up are reported and analyzed to identify natural frequencies and mode shapes of the investigated structure.

Coppi, F.; Cerutti, A.; Farina, P.; De Pasquale, G.; Novembrini, G. [IDS Ingegneria dei Sistemi S.p.A., Via Livornese 1019, Pisa (Italy)

2010-05-28T23:59:59.000Z

114

Millimeter Wave Cloud Radar (MMCR) Handbook  

SciTech Connect

The millimeter cloud radar (MMCR) systems probe the extent and composition of clouds at millimeter wavelengths. The MMCR is a zenith-pointing radar that operates at a frequency of 35 GHz. The main purpose of this radar is to determine cloud boundaries (e.g., cloud bottoms and tops). This radar will also report radar reflectivity (dBZ) of the atmosphere up to 20 km. The radar possesses a doppler capability that will allow the measurement of cloud constituent vertical velocities.

KB Widener; K Johnson

2005-01-30T23:59:59.000Z

115

How Radar Works | Open Energy Information  

Open Energy Info (EERE)

2013 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for How Radar Works Citation Institute For Geophysics. How Radar Works...

116

Overview: Hard Rock Penetration  

DOE Green Energy (OSTI)

The Hard Rock Penetration program is developing technology to reduce the costs of drilling and completing geothermal wells. Current projects include: lost circulation control, rock penetration mechanics, instrumentation, and industry/DOE cost shared projects of the Geothermal Drilling organization. Last year, a number of accomplishments were achieved in each of these areas. A new flow meter being developed to accurately measure drilling fluid outflow was tested extensively during Long Valley drilling. Results show that this meter is rugged, reliable, and can provide useful measurements of small differences in fluid inflow and outflow rates. By providing early indications of fluid gain or loss, improved control of blow-out and lost circulation problems during geothermal drilling can be expected. In the area of downhole tools for lost circulation control, the concept of a downhole injector for injecting a two-component, fast-setting cementitious mud was developed. DOE filed a patent application for this concept during FY 91. The design criteria for a high-temperature potassium, uranium, thorium logging tool featuring a downhole data storage computer were established, and a request for proposals was submitted to tool development companies. The fundamental theory of acoustic telemetry in drill strings was significantly advanced through field experimentation and analysis. A new understanding of energy loss mechanisms was developed.

Dunn, J.C.

1992-08-01T23:59:59.000Z

117

Overview - Hard Rock Penetration  

DOE Green Energy (OSTI)

The Hard Rock Penetration program is developing technology to reduce the costs of drilling and completing geothermal wells. Current projects include: lost circulation control, rock penetration mechanics, instrumentation, and industry/DOE cost shared projects of the Geothermal Drilling Organization. Last year, a number of accomplishments were achieved in each of these areas. A new flow meter being developed to accurately measure drilling fluid outflow was tested extensively during Long Valley drilling. Results show that this meter is rugged, reliable, and can provide useful measurements of small differences in fluid inflow and outflow rates. By providing early indications of fluid gain or loss, improved control of blow-out and lost circulation problems during geothermal drilling can be expected. In the area of downhole tools for lost circulation control, the concept of a downhole injector for injecting a two-component, fast-setting cementitious mud was developed. DOE filed a patent application for this concept during FY 91. The design criteria for a high-temperature potassium, uranium, thorium logging tool featuring a downhole data storage computer were established, and a request for proposals was submitted to tool development companies. The fundamental theory of acoustic telemetry in drill strings was significantly advanced through field experimentation and analysis. A new understanding of energy loss mechanisms was developed.

Dunn, James C.

1992-03-24T23:59:59.000Z

118

Overview: Hard Rock Penetration  

DOE Green Energy (OSTI)

The Hard Rock Penetration program is developing technology to reduce the costs of drilling and completing geothermal wells. Current projects include: lost circulation control, rock penetration mechanics, instrumentation, and industry/DOE cost shared projects of the Geothermal Drilling organization. Last year, a number of accomplishments were achieved in each of these areas. A new flow meter being developed to accurately measure drilling fluid outflow was tested extensively during Long Valley drilling. Results show that this meter is rugged, reliable, and can provide useful measurements of small differences in fluid inflow and outflow rates. By providing early indications of fluid gain or loss, improved control of blow-out and lost circulation problems during geothermal drilling can be expected. In the area of downhole tools for lost circulation control, the concept of a downhole injector for injecting a two-component, fast-setting cementitious mud was developed. DOE filed a patent application for this concept during FY 91. The design criteria for a high-temperature potassium, uranium, thorium logging tool featuring a downhole data storage computer were established, and a request for proposals was submitted to tool development companies. The fundamental theory of acoustic telemetry in drill strings was significantly advanced through field experimentation and analysis. A new understanding of energy loss mechanisms was developed.

Dunn, J.C.

1992-01-01T23:59:59.000Z

119

Monolithic ballasted penetrator  

DOE Patents (OSTI)

The present invention is a monolithic ballasted penetrator capable of delivering a working payload to a hardened target, such as reinforced concrete. The invention includes a ballast made from a dense heavy material insert and a monolithic case extending along an axis and consisting of a high-strength steel alloy. The case includes a nose end containing a hollow portion in which the ballast is nearly completely surrounded so that no movement of the ballast relative to the case is possible during impact with a hard target. The case is cast around the ballast, joining the two parts together. The ballast may contain concentric grooves or protrusions that improve joint strength between the case and ballast. The case further includes a second hollow portion; between the ballast and base, which has a payload fastened within this portion. The penetrator can be used to carry instrumentation to measure the geologic character of the earth, or properties of arctic ice, as they pass through it.

Hickerson, Jr., James P. (Cedar Crest, NM); Zanner, Frank J. (Sandia Park, NM); Baldwin, Michael D. (Albuquerque, NM); Maguire, Michael C. (Worcester, MA)

2001-01-01T23:59:59.000Z

120

A Marine Radar Wind Sensor  

Science Conference Proceedings (OSTI)

A new method for retrieving the wind vector from radar-image sequences is presented. This method, called WiRAR, uses a marine X-band radar to analyze the backscatter of the ocean surface in space and time with respect to surface winds. Wind ...

Heiko Dankert; Jochen Horstmann

2007-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Ultrasonic radar and its applications  

Science Conference Proceedings (OSTI)

A rangefinder is a device that measures distance from the observer to a target, for the purposes of surveying, determining focus in photography, or accurately aiming a weapon. Some devices use active methods to measure (such as sonar, laser, or radar); ... Keywords: PIC, radar, rangefinder, surveying, target, ultrasonic, weapon

Mansoor-Ul-Hassan Siddique

2009-08-01T23:59:59.000Z

122

Cloud-to-Ground Lightning in a Tornadic Storm on 8 May 1986  

Science Conference Proceedings (OSTI)

On 8 May 1986, the National Severe Storms Laboratory (NSSL) collected Doppler radar and lightning ground strike data on a supercell storm that produced three tornadoes, including an F3 tornado in Edmond, Oklahoma, approximately 40 km north of ...

Donald R. MacGorman; Kurt E. Nielsen

1991-07-01T23:59:59.000Z

123

Grounding intentionality  

E-Print Network (OSTI)

In this thesis, I argue that current attempts to ground intentionality face one of two challenges. Either the grounding feature of intentionality will be itself intentional or the grounding feature is disparate in nature from the representational capacity of an intentional mental state and therefore no connection between the two can be taken to exist. I examine two current accounts of intentionality and the features they utilize to ground it. I maintain that both views fall prey to one or both of the objections I raise. I conclude that any account of intentionality will need to meet both of these challenges in order to be counted successful.

Huizenga Steven R

2004-01-01T23:59:59.000Z

124

ARM Climate Research Facility Radar Operations Plan  

SciTech Connect

Roles, responsibilities, and processes associated with Atmospheric Radiation Measurement (ARM) Radar Operations.

Voyles, JW

2012-05-18T23:59:59.000Z

125

Universal penetration test apparatus with fluid penetration sensor  

DOE Patents (OSTI)

A universal penetration test apparatus is described for measuring resistance of a material to a challenge fluid. The apparatus includes a pad saturated with the challenge fluid. The apparatus includes a compression assembly for compressing the material between the pad and a compression member. The apparatus also includes a sensor mechanism for automatically detecting when the challenge fluid penetrates the material. 23 figs.

Johnson, P.W.; Stampfer, J.F.; Bradley, O.D.

1999-02-02T23:59:59.000Z

126

The Atmospheric Imaging Radar: Simultaneous Volumetric Observations Using a Phased Array Weather Radar  

Science Conference Proceedings (OSTI)

Mobile weather radars often utilize rapid-scan strategies when collecting observations of severe weather. Various techniques have been used to improve volume update times, including the use of agile and multibeam radars. Imaging radars, similar in ...

Bradley Isom; Robert Palmer; Redmond Kelley; John Meier; David Bodine; Mark Yeary; Boon-Leng Cheong; Yan Zhang; Tian-You Yu; Michael I. Biggerstaff

2013-04-01T23:59:59.000Z

127

Effects of Radar Beam Shielding on Rainfall Estimation for the Polarimetric C-Band Radar  

Science Conference Proceedings (OSTI)

Radar reflectivity (Zh), differential reflectivity (Zdr), and specific differential phase (Kdp) measured from the operational, polarimetric weather radar located in Trappes, France, were used to examine the effects of radar beam shielding on ...

Katja Friedrich; Urs Germann; Jonathan J. Gourley; Pierre Tabary

2007-11-01T23:59:59.000Z

128

Optical Communication System for Remote Monitoring and Adaptive Control of Distributed Ground Sensors Exhibiting Collective Intelligence  

Science Conference Proceedings (OSTI)

Comprehensive management of the battle-space has created new requirements in information management, communication, and interoperability as they effect surveillance and situational awareness. The objective of this proposal is to expand intelligent controls theory to produce a uniquely powerful implementation of distributed ground-based measurement incorporating both local collective behavior, and interoperative global optimization for sensor fusion and mission oversight. By using a layered hierarchal control architecture to orchestrate adaptive reconfiguration of autonomous robotic agents, we can improve overall robustness and functionality in dynamic tactical environments without information bottlenecks. In this concept, each sensor is equipped with a miniaturized optical reflectance modulator which is interactively monitored as a remote transponder using a covert laser communication protocol from a remote mothership or operative. Robot data-sharing at the ground level can be leveraged with global evaluation criteria, including terrain overlays and remote imaging data. Information sharing and distributed intelli- gence opens up a new class of remote-sensing applications in which small single-function autono- mous observers at the local level can collectively optimize and measure large scale ground-level signals. AS the need for coverage and the number of agents grows to improve spatial resolution, cooperative behavior orchestrated by a global situational awareness umbrella will be an essential ingredient to offset increasing bandwidth requirements within the net. A system of the type described in this proposal will be capable of sensitively detecting, tracking, and mapping spatial distributions of measurement signatures which are non-stationary or obscured by clutter and inter- fering obstacles by virtue of adaptive reconfiguration. This methodology could be used, for example, to field an adaptive ground-penetrating radar for detection of underground structures in urban environments and to detect chemical species concentrations in migrating plumes. Given is our research in these areas and a status report of our progress.

Cameron, S.M.; Stantz, K.M.; Trahan, M.W.; Wagner, J.S.

1998-11-01T23:59:59.000Z

129

Polarimetry for Weather Surveillance Radars  

Science Conference Proceedings (OSTI)

This paper is an overview of weather radar polarimetry emphasizing surveillance applications. The following potential benefits to operations are identified: improvement of quantitative precipitation measurements, discrimination of hail from rain ...

Dusan S. Zrnic; Alexander V. Ryzhkov

1999-03-01T23:59:59.000Z

130

Radar Reflectivity of Cumulus Clouds  

Science Conference Proceedings (OSTI)

The relationships between the radar reflectivity factor Z and significant physical cloud parameters are studied from a dataset collected with an instrumented aircraft in non- or very weakly precipitating warm clouds. The cloud droplet populations ...

Henri Sauvageot; Jilani Omar

1987-06-01T23:59:59.000Z

131

Radar Calibration: Some Simple Approaches  

Science Conference Proceedings (OSTI)

The proper calibration of weather radars has been at the heart of the problem of accurate reflectivity measurements for more than five decades. This paper summarizes a number of methods that have been used previously and others that areworthy of ...

David Atlas

2002-09-01T23:59:59.000Z

132

Ground Water  

NLE Websites -- All DOE Office Websites (Extended Search)

Water Nature Bulletin No. 408-A February 27, 1971 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation GROUND WATER We take...

133

Rooftop Photovoltaics Market Penetration Scenarios  

DOE Green Energy (OSTI)

The goal of this study was to model the market penetration of rooftop photovoltaics (PV) in the United States under a variety of scenarios, on a state-by-state basis, from 2007 to 2015.

Paidipati, J.; Frantzis, L.; Sawyer, H.; Kurrasch, A.

2008-02-01T23:59:59.000Z

134

Moving target indication via RADARSAT-2 multichannel synthetic aperture radar processing  

Science Conference Proceedings (OSTI)

With the recent launches of the German TerraSAR-X and the Canadian RADARSAT-2, both equipped with phased array antennas and multiple receiver channels, synthetic aperture radar, ground moving target indication (SAR-GMTI) data are now routinely being ...

S. Chiu; M. V. Dragoševi?

2010-01-01T23:59:59.000Z

135

A Bistatic Multiple-Doppler Radar Network  

Science Conference Proceedings (OSTI)

A multiple-Doppler radar network can be constructed using only one, traditional, transmitting pencil-beam radar and one or more passive, low-gain, nontransmitting receivers at remote sites. Radiation scattered from the pencil beam of the ...

Joshua Wurman; Stanley Heckman; Dennis Boccippio

1993-12-01T23:59:59.000Z

136

Radar Detection of Turbulence in Precipitation Environments  

Science Conference Proceedings (OSTI)

Imperfect particle tracer response is incorporated into the relations describing the turbulent air motion contribution to Doppler radar spectrum mean and variance. Tracer effects on radar estimates of the eddy dissipation rate (?) increase with ...

Alan R. Bohne

1982-08-01T23:59:59.000Z

137

Definition: Synthetic Aperture Radar | Open Energy Information  

Open Energy Info (EERE)

Aperture Radar Aperture Radar Jump to: navigation, search Dictionary.png Synthetic Aperture Radar Synthetic-aperture radar (SAR) is an active microwave remote sensing technology that measures the phase difference between a radar wave emitted from an antennae attached to a satellite or aircraft to generate high-resolution images of a surface.[1] View on Wikipedia Wikipedia Definition Also Known As SAR Related Terms radar References ↑ Synthetic Aperature Radar: Systems and Signal Processing (Curlander and McDonough - 1991 - book) fue LikeLike UnlikeLike You like this.Sign Up to see what your friends like. l cell, Retrieved from "http://en.openei.org/w/index.php?title=Definition:Synthetic_Aperture_Radar&oldid=493069" Category: Definitions What links here Related changes

138

Definition: Interferometric Synthetic Aperture Radar | Open Energy  

Open Energy Info (EERE)

Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar Jump to: navigation, search Dictionary.png Interferometric Synthetic Aperture Radar Interferometric Synthetic Aperture Radar (InSAR) utilizes SAR images from two different time periods to generate maps of surface deformation. The technique can potentially measure millimeter-scale changes in the Earth's surface.[1][2] View on Wikipedia Wikipedia Definition Also Known As InSAR, IfSAR Related Terms Synthetic Aperture Radar, radar, sustainability References ↑ Synthetic Aperture Radar Interferometry to Measure Earth's Surface Topography and Its Deformation (Burgmann et al. 2000) ↑ Improved Visulaization of Satellite Radar InSAR Observed Structural Controls at Producing Geothermal Field Using Modeled Horizontal Surface Displacements(Opplinger et al. 2006)

139

Doppler Radar Sampling Limitations in Convective Storms  

Science Conference Proceedings (OSTI)

Vertical air motion data from a T-28 aircraft were filtered and sampled to simulate Doppler radar measurements. The results suggest that multiple Doppler radar analyses are subject to potentially large spatial aliasing errors in deep convection ...

R. E. Carbone; M. J. Carpenter; C. D. Burghart

1985-09-01T23:59:59.000Z

140

Understanding Radar Refractivity: Sources of Uncertainty  

Science Conference Proceedings (OSTI)

This study presents a 2-yr-long comparison of Weather Surveillance Radar-1988 Doppler (WSR-88D) refractivity retrievals with Oklahoma Mesonetwork (“Mesonet”) and sounding measurements and discusses some challenges to implementing radar ...

David Bodine; Dan Michaud; Robert D. Palmer; Pamela L. Heinselman; Jerry Brotzge; Nick Gasperoni; Boon Leng Cheong; Ming Xue; Jidong Gao

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Airborne Doppler Radar Data Analysis Workshop  

Science Conference Proceedings (OSTI)

The Airborne Doppler Radar Data Analysis Workshop, sponsored by the Atmospheric Technology Division (ATD) of the National Center for Atmospheric Research (NCAR), was the first to focus on analyzing airborne Doppler radar data. The workshop (held ...

Wen-Chau Lee; Frank D. Marks; Craig Walther

2003-08-01T23:59:59.000Z

142

Optimal Planning of a Weather Radar Network  

Science Conference Proceedings (OSTI)

An approach to the optimal planning of a weather radar network is presented. In the approach, several aspects affecting the planning decision, including terrain blockage, the need to measure with two Doppler weather radars in some regions, and ...

R. Minciardi; R. Sacile; F. Siccardi

2003-09-01T23:59:59.000Z

143

Synthetic Aperture Radar Imagery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Imagery Sandia has collected and real-time processed over 400,000 synthetic aperture radar images. The following is a selection of imagery available for...

144

Operational Application of Meteorological Doppler Radar  

Science Conference Proceedings (OSTI)

Single Doppler weather radar velocity and reflectivity fields have been obtained with the National Center for Atmospheric Research (NCAR) 5 cm radars for a wide variety of weather situations. Among those weather features that can be identified by ...

James Wilson; Richard Carbone; Harold Baynton; Robert Serafin

1980-10-01T23:59:59.000Z

145

ARMAR: An Airborne Rain-Mapping Radar  

Science Conference Proceedings (OSTI)

A new airborne rain-mapping radar (ARMAR) has been developed by NASA and the Jet Propulsion Laboratory for operation on the NASA Ames DC-8 aircraft. The radar operates at 13.8 GHz, the frequency to be used by the radar on the Tropical Rainfall ...

S. L. Durden; E. Im; F. K. Li; W. Ricketts; A. Tanner; W. Wilson

1994-06-01T23:59:59.000Z

146

Scanning ARM Cloud Radar Handbook  

SciTech Connect

The scanning ARM cloud radar (SACR) is a polarimetric Doppler radar consisting of three different radar designs based on operating frequency. These are designated as follows: (1) X-band SACR (X-SACR); (2) Ka-band SACR (Ka-SACR); and (3) W-band SACR (W-SACR). There are two SACRs on a single pedestal at each site where SACRs are deployed. The selection of the operating frequencies at each deployed site is predominantly determined by atmospheric attenuation at the site. Because RF attenuation increases with atmospheric water vapor content, ARM's Tropical Western Pacific (TWP) sites use the X-/Ka-band frequency pair. The Southern Great Plains (SGP) and North Slope of Alaska (NSA) sites field the Ka-/W-band frequency pair. One ARM Mobile Facility (AMF1) has a Ka/W-SACR and the other (AMF2) has a X/Ka-SACR.

Widener, K; Bharadwaj, N; Johnson, K

2012-06-18T23:59:59.000Z

147

Microwave emissions from police radar  

E-Print Network (OSTI)

The purpose of this study was to evaluate police officers exposures to microwaves emitted by traffic radar units at the ocular and testicular level. Additionally, comparisons were made of the radar manufacturers published maximum power density specifications and actual measured power densities taken at the antenna face of those units. Four different speed enforcement agencies and one transportation research institute provided fifty four different radar units for evaluation. Of those units, nine dash mounted. five rear mounted, and three hand held models were included. During this study, only four of the 986 measurements taken exceeded the American National Standards Institute(ANSI) limit of 5 MW/CM2 , and none exceeded the American Conference of Governmental Industrial Hygienists(ACGIH), Institute of Electrical and Electronic Engineers(IEEE), or Occupational Safety and Health Administration(OSHA) standard of 10 MW/CM2 . None of the 812 measurements taken at the officers seated ocular and testicular positions exceeded .04 MW/CM2. In fact, the highest reading observed in the drivers' position was .034 MW/CM2 taken at the 5th percentile testicular level, less than 1% of the lowest current safety standard. Because of the confusion that exists in the medical and scientific communities concerning non-ionizing radiation, the extent of health risks associated with long term exposure to police radar is not yet known. Until science has indisputably proven that long term, low power exposure is not harmful, it is recommended that police departments take steps to limit officer exposure. There are several ways that police departments can limit exposure cheaply and with minimal effort. The purchasing department should first consider radar units with the lowest published maximum power densities. New hand held radar units should not be purchased because they leave open the opportunity for operators to place their bodies in the radar beam path. Purchasing units whose antennae mount outside the patrol vehicle will also lower exposure to microwaves. Finally, training that stresses the importance of using the radar units' stand-by mode when not actually monitoring traffic will further limit exposure.

Fink, John Michael

1994-01-01T23:59:59.000Z

148

Sidelobe Contamination in Bistatic Radars  

Science Conference Proceedings (OSTI)

The problem of sidelobe contamination in a bistatic network is explored. The McGill bistatic network consists of one S-band Doppler radar and two low-gain passive receivers at remote sites. Operational experience with the bistatic network ...

Ramón de Elía; Isztar Zawadzki

2000-10-01T23:59:59.000Z

149

Field Training in Radar Meteorology  

Science Conference Proceedings (OSTI)

The NSF Division of Mesoscale Meteorology and the University of Nevada—Reno (UNR) provided support for a two-week field course at the CSU—CHILL radar during 12—24 May 1991. Ten atmospheric science graduate students and two faculty from the Desert ...

John Hallett; Melanie Wetzel; Steven Rutledge

1993-01-01T23:59:59.000Z

150

High-Temporal-Resolution Capabilities of the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

Since 2007 the advancement of the National Weather Radar Testbed Phased-Array Radar (NWRT PAR) hardware and software capabilities has been supporting the implementation of high-temporal-resolution (1 min) sampling. To achieve the increase in ...

Pamela L. Heinselman; Sebastián M. Torres

2011-03-01T23:59:59.000Z

151

Measurement of Atmospheric Aspect Sensitivity Using Coherent Radar Imaging after Mitigation of Radar Beam Weighting Effect  

Science Conference Proceedings (OSTI)

The aspect angle, a measurement of the aspect sensitivity of atmospheric refractivity irregularities, was estimated with multiple-receiver coherent radar imaging (CRI) of very high frequency (VHF) atmospheric radar. Two CRI parameters retrieved by ...

Jenn-Shyong Chen; Jun-ichi Furumoto

2013-02-01T23:59:59.000Z

152

Monitoring the Reflectivity Calibration of a Scanning Radar Using a Profiling Radar and a Disdrometer  

Science Conference Proceedings (OSTI)

This paper describes a method of absolutely calibrating and routinely monitoring the reflectivity calibration from a scanning weather radar using a vertically profiling radar that has been absolutely calibrated using a collocated surface ...

Christopher R. Williams; Kenneth S. Gage; Wallace Clark; Paul Kucera

2005-07-01T23:59:59.000Z

153

Range dependent errors in the convective and stratiform partitioning of a radar precipitation estimation algorithm  

E-Print Network (OSTI)

The Tropical Rainfall Measuring Mission (TRMM), designed to assist climate and atmospheric circulation modeling efforts by providing accurate information on tropical precipitation and latent-heat release, will require ground based validation of satellite derived rainfall totals and type classification. A key element in ground validation is the precipitation classification method authored by Steiner and Houze. The method partitions precipitation by type using a radar reflectivity threshold technique. Steiner and Houze report a lack of any significant range dependency, despite the normal problems associated with beam spreading and increasing altitude with range. This study will examine the Steiner and Houze classification method to quantify the effect of range dependent problems in discerning precipitation type. Radar data for this study were collected on January 10 and 18, 1993 during the Tropical Ocean Global Atmosphere (TOGA) Coupled Ocean-Atmosphere Response Experiment (COARE), by the National Oceanic and Atmospheric Administration (NOAA) N42RF WP-3D Orion aircraft's tail Doppler radar as well as the Massachusetts Institute of Technology's (MIT) Doppler radar deployed on board the United States research vessel Vickers. The data were chosen so the PW-3D tail radar data set maintained low ranges to precipitation of interest while the MIT radar data set possessed a wide variation of range. Possible error sources such as position error, radar calibration error, and temporal data collection differences, were minimized so that range dependency could be focused on. Range dependent beam spreading influenced precipitation classification over the largest span of ranges, and the greatest portion of the data. Also, beam spreading was found to increase the horizontal extent of precipitation areas in a direction perpendicular to the central axis of the radar beam. Overall, using the Steiner and Houze classification method, 24.0% and 21.6% of the precipitation with reflectivity greater than 15 dBZ was classified differently by the two radar data sets at the 1.5 km and 3.0 km analysis levels respectively. The percentage of total rainfall from all precipitation classified differently was 26% for the 1.5 km analysis level, and 28% for the 3.0 km level.

Wood, David Richard

1996-01-01T23:59:59.000Z

154

Intercomparison of Ground-Based Velocity Track Display (GBVTD)-Retrieved Circulation Centers and Structures of Hurricane Danny (1997) from Two Coastal WSR-88Ds  

Science Conference Proceedings (OSTI)

A plausible primary circulation and circulation center of a tropical cyclone (TC) can be deduced from a coastal Doppler radar using the ground-based velocity track display (GBVTD) technique and the GBVTD-simplex algorithm. The quality of the ...

Shirley T. Murillo; Wen-Chau Lee; Michael M. Bell; Gary M. Barnes; Frank D. Marks Jr.; Peter P. Dodge

2011-01-01T23:59:59.000Z

155

The 30th International Conference on Radar Meteorology  

Science Conference Proceedings (OSTI)

The 30th International Conference on Radar Meteorology, held in Munich, Germany, 19–24 July 2001, highlighted recent progress in the field of radar meteorology and demonstrated how radar is used in many integrated ways to better understand and ...

Matthias Steiner; Peter F. Meischner

2002-11-01T23:59:59.000Z

156

Weld penetration and defect control  

SciTech Connect

Highly engineered designs increasingly require the use of improved materials and sophisticated manufacturing techniques. To obtain optimal performance from these engineered products, improved weld properties and joint reliability are a necessarily. This requirement for improved weld performance and reliability has led to the development of high-performance welding systems in which pre-programmed parameters are specified before any welding takes place. These automated systems however lack the ability to compensate for perturbations which arise during the welding process. Hence the need for systems which monitor and control the in-process status of the welding process. This report discusses work carried out on weld penetration indicators and the feasibility of using these indicators for on-line penetration control.

Chin, B.A.

1992-05-15T23:59:59.000Z

157

Rapid Sampling of Severe Storms by the National Weather Radar Testbed Phased Array Radar  

Science Conference Proceedings (OSTI)

A key advantage of the National Weather Radar Testbed Phased Array Radar (PAR) is the capability to adaptively scan storms at higher temporal resolution than is possible with the Weather Surveillance Radar-1988 Doppler (WSR-88D): 1 min or less ...

Pamela L. Heinselman; David L. Priegnitz; Kevin L. Manross; Travis M. Smith; Richard W. Adams

2008-10-01T23:59:59.000Z

158

Ultra-wideband radar motion sensor  

DOE Patents (OSTI)

A motion sensor is based on ultra-wideband (UWB) radar. UWB radar range is determined by a pulse-echo interval. For motion detection, the sensors operate by staring at a fixed range and then sensing any change in the averaged radar reflectivity at that range. A sampling gate is opened at a fixed delay after the emission of a transmit pulse. The resultant sampling gate output is averaged over repeated pulses. Changes in the averaged sampling gate output represent changes in the radar reflectivity at a particular range, and thus motion. 15 figs.

McEwan, T.E.

1994-11-01T23:59:59.000Z

159

The Retrieval of Asymmetric Tropical Cyclone Structures Using Doppler Radar Simulations and Observations with the Extended GBVTD Technique  

Science Conference Proceedings (OSTI)

The ground-based velocity track display (GBVTD) technique is extended to two Doppler radars to retrieve the structure of a tropical cyclone’s (TC’s) circulation. With this extension, it is found that the asymmetric part of the TC radial wind ...

Yu-Chieng Liou; Tai-Chi Chen Wang; Wen-Chau Lee; Ya-Ju Chang

2006-04-01T23:59:59.000Z

160

Snow studies, Part III-B: Ensemble retrieval of snow microphysics from dual wavelength vertically pointing radars  

Science Conference Proceedings (OSTI)

Based on the theory developed in Part III-A, this paper introduces a new method to retrieve snow microphysics from ground-based collocated X- and W-band vertically pointing Doppler radars. To take into account the variety of microphysical ...

Wanda Szyrmer; Isztar Zawadzki

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Retrieval of Precipitation Profiles from Airborne Radar and Passive Radiometer Measurements: Comparison with Dual-Frequency Radar Measurements  

Science Conference Proceedings (OSTI)

This study compares precipitation rate profiles derived from a single frequency radar and radiometer with such profiles derived from a dual-frequency radar.

J. A. Weinman; R. Meneghini; K. Nakamura

1990-10-01T23:59:59.000Z

162

Ultra-wideband radar sensors and networks  

DOE Patents (OSTI)

Ultra wideband radar motion sensors strategically placed in an area of interest communicate with a wireless ad hoc network to provide remote area surveillance. Swept range impulse radar and a heart and respiration monitor combined with the motion sensor further improves discrimination.

Leach, Jr., Richard R; Nekoogar, Faranak; Haugen, Peter C

2013-08-06T23:59:59.000Z

163

Utilizing Spaceborne Radars to Retrieve Dry Snowfall  

Science Conference Proceedings (OSTI)

A dataset consisting of one year of CloudSat Cloud Profiling Radar (CPR) near-surface radar reflectivity Z associated with dry snowfall is examined in this study. The CPR observations are converted to snowfall rates S using derived Ze–S ...

Mark S. Kulie; Ralf Bennartz

2009-12-01T23:59:59.000Z

164

Mean winds observed with Indian MST radar over tropical mesosphere and comparison with various techniques  

E-Print Network (OSTI)

Abstract. Temporal variation of mean winds between the 65 to 85 km height region from the data collected over the course of approximately four years (1995–99), using the Indian MST radar located at Gadanki (13.5 ? N, 79.2 ? E), India is presented in this paper. Mesospheric mean winds and their seasonal variation in the horizontal and vertical components are presented in detail. Westward flows during each of the equinoxes and eastward flows during the solstices are observed in the zonal component. The features of the semiannual oscillation (SAO) and the quasi-biennial oscillation (QBO) in the zonal component are noted. In the meridional component, contours reveal a northward motion during the winter and a southward motion during the summer. Large inter-annual variability is found in the vertical component with magnitudes of the order of ±2 ms ?1. The MST observed winds are also compared with the winds observed by the MF radar located at Tirunelveli (8.7 ? N, 77.8 ? E), India, the High Resolution Doppler Imager (HRDI) onboard the Upper Atmospheric Research Satellite (UARS), and with the CIRA-86 model. A very good agreement is found between both the ground-based instruments (MST radar and MF radar) in the zonal component and there are few discrepancies in the meridional component. UARS/HRDI observed winds usually have larger magnitudes than the ground-based mean winds. Comparison of the MST derived winds with the CIRA-86 model in the zonal component shows that during the spring equinox and the summer, the winds agree fairly well, but there are a lot of discrepancies in the other seasons and the observed winds with the MST radar are less in magnitude, though the direction is same. The strengths and limitations in estimating reliable mesospheric mean winds using

M. Venkat Ratnam; D. Narayana Rao; T. Narayana Rao; S. Thulasiraman; J. B. Nee; S. Gurubaran; R. Rajaram

2000-01-01T23:59:59.000Z

165

In-place HEPA filter penetration test  

SciTech Connect

We have demonstrated the feasibility of conducting penetration tests on high efficiency particulate air (HEPA) filters as installed in nuclear ventilation systems. The in-place penetration test, which is designed to yield equivalent penetration measurements as the standard DOP efficiency test, is based on measuring the aerosol penetration of the filter installation as a function of particle size using a portable laser particle counter. This in-place penetration test is compared to the current in-place leak test using light scattering photometers for single HEPA filter installations and for HEPA filter plenums using the shroud method. Test results show the in-place penetration test is more sensitive than the in-place leak test, has a similar operating procedure, but takes longer to conduct. Additional tests are required to confirm that the in-place penetration test yields identical results as the standard dioctyl phthalate (DOP) penetration test for HEPA filters with controlled leaks in the filter and gasket and duct by-pass leaks. Further development of the procedure is also required to reduce the test time before the in- place penetration test is practical.

Bergman, W.; Wilson, kK.; Elliott, J.; Bettencourt, B.; Slawski, J.W.

1997-01-01T23:59:59.000Z

166

DOE/SC-ARM-12-009 ARM Radar Organization JW Voyles  

NLE Websites -- All DOE Office Websites (Extended Search)

Bharadwaj Radar Calibration Plan, controlled document Nitin Bharadwaj Instrument Handbooks, controlled documents Kevin Widener Radar status and information: www.radar.arm.gov...

167

Using doppler radar images to estimate aircraft navigational heading error  

SciTech Connect

A yaw angle error of a motion measurement system carried on an aircraft for navigation is estimated from Doppler radar images captured using the aircraft. At least two radar pulses aimed at respectively different physical locations in a targeted area are transmitted from a radar antenna carried on the aircraft. At least two Doppler radar images that respectively correspond to the at least two transmitted radar pulses are produced. These images are used to produce an estimate of the yaw angle error.

Doerry, Armin W. (Albuquerque, NM); Jordan, Jay D. (Albuquerque, NM); Kim, Theodore J. (Albuquerque, NM)

2012-07-03T23:59:59.000Z

168

Cloud-to-Ground Lightning throughout the Lifetime of a Severe Storm System in Oklahoma  

Science Conference Proceedings (OSTI)

Cloud-to-ground (CG) lightning data are examined relative to digitized radar data for a storm system that occurred in Oklahoma on 26 May 1985. This system evolved through three stages: 1) two lines of cells, one near the dryline and the other 60 ...

Mark A. Shafer; Donald R. MacGorman; Frederick H. Carr

2000-06-01T23:59:59.000Z

169

Definition: Penetration Rate | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Penetration Rate Jump to: navigation, search Dictionary.png Penetration Rate The Rate of penetration, abbreviated as ROP as used in the drilling industry, is the speed at which a drill bit breaks the rock under it to deepen the borehole. It is normally measured in feet per minute or meters per hour, but sometimes it is expressed in minutes per foot.[1] View on Wikipedia Wikipedia Definition The Rate of penetration, abbreviated as ROP as used in the drilling industry, is the speed at which a drill bit breaks the rock under it to deepen the borehole. Also known as penetration rate or drill rate. It is normally measured in feet per minute or meters per hour, but sometimes it is expressed in minutes per foot.

170

Virtual CSU-CHILL Radar: The VCHILL  

Science Conference Proceedings (OSTI)

The Virtual CHILL (VCHILL) system makes it possible to transfer the educational and research experience of the Colorado State University dual polarization radar to remote locations over the Internet. The VCHILL operation includes remote control ...

V. Chandrasekar; Yoong-Goog Cho; D. Brunkow; A. Jayasumana

2005-07-01T23:59:59.000Z

171

Mean Radar Echo Characteristics during Project GALE  

Science Conference Proceedings (OSTI)

The mean radar echo characteristics during the Genesis of Atlantic Lows Experiment (GALE) are presented for the southeastern United States during the 15 January–15 March 1986 field phase of the program. The echo characteristics were derived from ...

Thomas J. Trunk; Lance F. Bosart

1990-02-01T23:59:59.000Z

172

Optimization of Multiparameter Radar Estimates of Rainfall  

Science Conference Proceedings (OSTI)

The estimates of rainfall rate derived from a multiparameter radar based on reflectivity factor (RZH), differential reflectivity (RDR), and specific differential propagation phase (RDP) have widely varying accuracies over the dynamic range of the ...

V. Chandrasekar; Eugenio Gorgucci; Gianfranco Scarchilli

1993-07-01T23:59:59.000Z

173

On the Sensitivity of Weather Radars  

Science Conference Proceedings (OSTI)

This paper discusses the subject of weather radar system sensitivity from a general point of view, with emphasis an the influence of wavelength. Expressions for the echo signal-to-noise ratio are examined using a detection theory approach to ...

Paul L. Smith

1986-12-01T23:59:59.000Z

174

Radar Backscattering by Inhomogeneous Precipitation Particles  

Science Conference Proceedings (OSTI)

Calculations of radar backscattering by inhomogeneous precipitation particles require values of the dielectric function of two-component mixtures. Four such dielectric functions are critically examined and their relative merits are weighed. ...

Craig F. Bohren; Louis J. Battan

1980-08-01T23:59:59.000Z

175

Multiple-Doppler Radar Network Design  

Science Conference Proceedings (OSTI)

Observing programs utilizing Doppler radar must have them deployed in optimum locations to best satisfy experimental objectives and maximize economies. One wishes to determine the coordinate triples (xi, yi, zi), where i equals the number of ...

Peter S. Ray; Karen L. Sangren

1983-08-01T23:59:59.000Z

176

Radar and Radiation Properties of Ice Clouds  

Science Conference Proceedings (OSTI)

The authors derive relations of the equivalent radar reflectivity Ze and extinction coefficient ? of ice clouds and confirm the theory by in situ aircraft observations during the First International Satellite Cloud Climatology Project Regional ...

David Atlas; Sergey Y. Matrosov; Andrew J. Heymsfield; Ming-Dah Chou; David B. Wolff

1995-11-01T23:59:59.000Z

177

Geostationary Doppler Radar and Tropical Cyclone Surveillance  

Science Conference Proceedings (OSTI)

The potential usefulness of spaceborne Doppler radar as a tropical cyclone observing tool is assessed by conducting a high-resolution simulation of an intense hurricane and generating synthetic observations of reflectivity and radial velocity. The ...

William E. Lewis; Eastwood Im; Simone Tanelli; Ziad Haddad; Gregory J. Tripoli; Eric A. Smith

2011-10-01T23:59:59.000Z

178

Radar System Errors in Polarization Diversity Measurements  

Science Conference Proceedings (OSTI)

The measurement capability of a polarization diversity radar is limited by several characteristics of the system and particularly by the performance of the antenna, which is characterized by the integrated cancellation ratio or integrated cross-...

James I. Metcalf; James S. Ussailis

1984-06-01T23:59:59.000Z

179

Mapping of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

Two sets of equations are derived to 1) map airborne Doppler radar data from an aircraft-relative coordinate system to an earth-relative coordinate system, and 2) remove the platform motion from the observed Doppler velocities. These equations ...

Wen-Chau Lee; Peter Dodge; Frank D. Marks Jr.; Peter H. Hildebrand

1994-04-01T23:59:59.000Z

180

Transmission Line Grounding  

Science Conference Proceedings (OSTI)

In 2008, the Electric Power Research Institute (EPRI) published a comprehensive grounding report. Published in two parts, the report covered the theoretical and practical aspects of transmission line grounding practices. To further improve the tools available for grounding analysis, an investigation into practical ways to calculate the fault current distribution and ground potential rise of the transmission line grounding system was conducted. Furthermore, a survey of utilities has documented industry pr...

2011-12-23T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

A Comparison of Tornado Warning Lead Times with and without NEXRAD Doppler Radar  

Science Conference Proceedings (OSTI)

The installation of the network of NEXRAD (Next Generation Weather Radar) WSR-88D (Weather Surveillance Radar—1988 Doppler) radars has been an ongoing process for more than three years. An assessment is made on how these radars and related ...

Paul Bieringer; Peter S. Ray

1996-03-01T23:59:59.000Z

182

Strengths and Limitations of Current Radar Systems for Two Stakeholder Groups in the Southern Plains  

Science Conference Proceedings (OSTI)

Advancements in radar technology since the deployment of the Weather Surveillance Radar-1988 Doppler (WSR-88D) network have prompted consideration of radar replacement technologies. In order for the outcomes of advanced radar research and ...

Daphne S. LaDue; Pamela L. Heinselman; Jennifer F. Newman

2010-07-01T23:59:59.000Z

183

Integrating High Penetrations of PV into Southern California: Year 2 Project Update; Preprint  

DOE Green Energy (OSTI)

Southern California Edison (SCE) is well into a five-year project to install a total of 500 MW of distributed photovoltaic (PV) energy within its utility service territory. Typical installations to date are 1-3 MW peak rooftop PV systems that interconnect to medium-voltage urban distribution circuits or larger (5 MW peak) ground-mounted systems that connect to medium-voltage rural distribution circuits. Some of the PV system interconnections have resulted in distribution circuits that have a significant amount of PV generation compared to customer load, resulting in high-penetration PV integration scenarios. The National Renewable Energy Laboratory (NREL) and SCE have assembled a team of distribution modeling, resource assessment, and PV inverter technology experts in order to investigate a few of the high-penetration PV distribution circuits. Currently, the distribution circuits being studied include an urban circuit with a PV penetration of approximately 46% and a rural circuit with a PV penetration of approximately 60%. In both cases, power flow on the circuit reverses direction, compared to traditional circuit operation, during periods of high PV power production and low circuit loading. Research efforts during year two of the five-year project were focused on modeling the distribution system level impacts of high-penetration PV integrations, the development and installation of distribution circuit data acquisition equipment appropriate for quantifying the impacts of high-penetration PV integrations, and investigating high-penetration PV impact mitigation strategies. This paper outlines these research efforts and discusses the following activities in more detail: the development of a quasi-static time-series test feeder for evaluating high-penetration PV integration modeling tools; the advanced inverter functions being investigated for deployment in the project's field demonstration and a power hardware-in-loop test of a 500-kW PV inverter implementing a limited set of advanced inverter functions.

Mather, B.; Neal, R.

2012-08-01T23:59:59.000Z

184

Use of the CSU–CHILL Radar in Radar Meteorology Education at Colorado State University  

Science Conference Proceedings (OSTI)

A recent example illustrating the use of the CSU–CHILL Doppler radar in a graduate-level course in radar meteorology at Colorado State University (CSU) is described. In addition to providing students in the Department of Atmospheric Science with “...

Steven A. Rutledge; Patrick C. Kennedy; David A. Brunkow

1993-01-01T23:59:59.000Z

185

Nonuniform Beamfilling Correction for Spaceborne Radar Rainfall Measurement: Implications from TOGA COARE Radar Data Analysis  

Science Conference Proceedings (OSTI)

A method is studied to make a nonuniform beamfilling (NUBF) correction for the path-integrated attenuation (PIA) derived from spaceborne radar measurement. The key of this method is to estimate rain-rate variability within a radar field of view ...

Toshiaki Kozu; Toshio Iguchi

1999-11-01T23:59:59.000Z

186

Lightning from Two National Detection Networks Related to Vertically Integrated Liquid and Echo-Top Information from WSR-88D Radar  

Science Conference Proceedings (OSTI)

Two national cloud-to-ground (CG) lightning-detection systems were operating across the contiguous United States during 1993. These two networks are compared to each other and to WSR-88D radar information collected by the Twin Lakes, Oklahoma, ...

Andrew I. Watson; Ronald L. Holle; RaúL. E. López

1995-09-01T23:59:59.000Z

187

Three-Dimensional Wind Field Analysis from Dual-Doppler Radar Data. Part III: The Boundary Condition: An Optimum Determination Based on a Variational Concept  

Science Conference Proceedings (OSTI)

The choice of the boundary condition when integrating the air mass continuity equation, is a major problem of the 3D wind field analysis from dual (or multiple) Doppler radar data. A zero vertical velocity at ground level seems the most natural ...

M. Chong; J. Testud

1983-07-01T23:59:59.000Z

188

A Comparison Of WSR-88D Reflectivities, SSM/I Brightness Temperatures, and Lightning for Mesoscale Convective Systems in Texas. Part I: Radar Reflectivity and Lightning  

Science Conference Proceedings (OSTI)

This is the first part of a two part study. Part I compares radar data from the League City, Texas, WSR-88D and cloud-to-ground (CG) lightning data for a set of eight mesoscale convective systems (MCSs), which occur at various stages of ...

E. Richard Toracinta; Karen I. Mohr; Edward J. Zipser; Richard E. Orville

1996-06-01T23:59:59.000Z

189

Radar and infrared remote sensing of geothermal features at Pilgrim Springs, Alaska  

Science Conference Proceedings (OSTI)

High-altitude radar and thermal imagery collected by the NASA research aircraft WB57F were used to examine the structural setting and distribution of radiant temperatures of geothermal anomalies in the Pilgrim Springs, Alaska area. Like-polarized radar imagery with perpendicular look directions provides the best structural data for lineament analysis, although more than half the mapped lineaments are easily detectable on conventional aerial photography. Radiometer data and imagery from a thermal scanner were used to evaluate radiant surface temperatures, which ranged from 3 to 17 C. The evening imagery, which utilized density-slicing techniques, detected thermal anomalies associated with geothermal heat sources. The study indicates that high-altitude predawn thermal imagery may be able to locate relatively large areas of hot ground in site-specific studies in the vegetated Alaskan terrain. This imagery will probably not detect gentle lateral gradients.

Dean, K.G. (Univ. of Alaska, Fairbanks,); Forbes, R.B.

1982-11-01T23:59:59.000Z

190

Electrical Subsurface Grounding Analysis  

SciTech Connect

The purpose and objective of this analysis is to determine the present grounding requirements of the Exploratory Studies Facility (ESF) subsurface electrical system and to verify that the actual grounding system and devices satisfy the requirements.

J.M. Calle

2000-11-01T23:59:59.000Z

191

Temporary fire sealing of penetrations on TFTR  

DOE Green Energy (OSTI)

The radiation shielding provided for TFTR for D-D and D-T operation will be penetrated by numerous electrical and mechanical services. Eventually, these penetrations will have to be sealed to provide the required fire resistance, tritium sealability, pressure integrity and radiation attenuation. For the initial hydrogen operation, however, fire sealing of the penetrations in the walls and floor is the primary concern. This report provides a discussion of the required and desirable properties of a temporary seal which can be used to seal these penetrations for the hydrogen operation and then subsequently be removed and replaced as required for the D-D and D-T operations. Several candidate designs are discussed and evaluated and recommendations are made for specific applications.

Hondorp, H.L.

1981-02-01T23:59:59.000Z

192

Radiosonde Penetration of an Undilute Cumulonimbus Anvil  

Science Conference Proceedings (OSTI)

An example is presented of the serendipitous radiosonde penetration through the western edge of a rapidly growing undilute cumulonimbus anvil above 200 mb by an operationally released radiosonde balloon. The sounding is supportive of deep ...

Lance F. Bosart; John W. Nielsen

1993-06-01T23:59:59.000Z

193

An Integrated Display and Analysis Methodology for Multivariable Radar Data  

Science Conference Proceedings (OSTI)

Polarimetric Doppler radars provide valuable information about the kinematic and microphysical structure of storms. However, in-depth analysis using radar products, such as Doppler-derived wind vectors and hydrometeor identification, has been ...

Brenda A. Dolan; Steven A. Rutledge

2007-08-01T23:59:59.000Z

194

An 11-cm Coherent Polarimetric Radar for Meteorological Research  

Science Conference Proceedings (OSTI)

The Geophysics Directorate of the U.S. Air Force developed a unique 11-cm (S-band) coherent polarimetric radar. The radar can transmit signals of alternating orthogonal polarizations, with either circular or linear basis, and receive signals of ...

James I. Metcalf; Alexander W. Bishop; Richard C. Chanley; Timothy C. Hiett; Pio J. Petrocchi

1993-06-01T23:59:59.000Z

195

A 94-GHz Doppler Radar for Cloud Observations  

Science Conference Proceedings (OSTI)

A Doppler radar operating at 3.2 mm wavelength was designed and assembled primarily for observation of clouds and precipitation. Phase detection of the radar signals which is required for Doppler operation is implemented through the use of a ...

Roger Lhermitte

1987-03-01T23:59:59.000Z

196

Inversion of Marine Radar Images for Surface Wave Analysis  

Science Conference Proceedings (OSTI)

A method to estimate sea surface elevation maps from marine radar image sequences is presented. This method is the extension of an existing inverse modeling technique to derive wave spectra from marine radar images, which assumes linear wave ...

JoséC. Nieto Borge; Germán RodrÍguez RodrÍguez; Katrin Hessner; Paloma Izquierdo González

2004-08-01T23:59:59.000Z

197

Simulating Range Oversampled Doppler Radar Profiles of Inhomogeneous Targets  

Science Conference Proceedings (OSTI)

A new technique for generating range oversampled profiles of Doppler radar signals that have been backscattered by distributed targets is presented in this paper. The technique was developed for spaceborne cloud radars, but it can just as well be ...

N. A. J. Schutgens

2008-09-01T23:59:59.000Z

198

Dual-Polarization Radar Characteristics of an Apartment Fire  

Science Conference Proceedings (OSTI)

Dual-polarimetric microwave wavelength radar observations of an apartment fire in Huntsville, Alabama, on 3 March 2008 are examined to determine the radar-observable properties of ash and fire debris lofted into the atmosphere. Dual-polarimetric ...

Thomas A. Jones; Sundar A. Christopher; Walt Petersen

2009-10-01T23:59:59.000Z

199

Retrieval of Reflectivity in a Networked Radar Environment  

Science Conference Proceedings (OSTI)

A system for reflectivity and attenuation retrieval for rain medium in a networked radar environment is described. Electromagnetic waves backscattered from a common volume in networked radar systems are attenuated differently along the different ...

V. Chandrasekar; S. Lim

2008-10-01T23:59:59.000Z

200

Spotlight-Mode Synthetic Aperture Radar: A Signal Processing Approach  

Science Conference Proceedings (OSTI)

From the Publisher:Spotlight-mode Synthetic Aperture Radar: A Signal Processing Approach describes an important mode of synthetic aperture radar (SAR) imaging, known as spotlight-mode SAR. By treating the subject via the principles of signal processing, ...

Paul Thompson; Daniel E. Wahl; Paul H. Eichel; Dennis C. Ghiglia; Charles V. Jakowatz

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Auxiliary Signal Processing System for a Multiparameter Radar  

Science Conference Proceedings (OSTI)

The design of an auxiliary signal processor for a multiparameter radar is described with emphasis on low cost, quick development, and minimum disruption of radar operations. The processor is based around a low-cost digital signal processor card ...

V. Chandrasekar; G. R. Gray; I. J. Caylor

1993-06-01T23:59:59.000Z

202

Factors Affecting the Accuracy of SHOWEX HF Radar Wave Measurements  

Science Conference Proceedings (OSTI)

Ocean Surface Current Radar (OSCR) HF radar measurements of ocean waves and currents were made during the Shoaling Waves Experiment (SHOWEX) in the fall of 1999. During some periods, at some locations, good quality wave measurements were ...

Lucy R. Wyatt; Guennadi Liakhovetski; Hans C. Graber; Brian K. Haus

2005-07-01T23:59:59.000Z

203

A Dual-Wavelength Radar Method to Measure Snowfall Rate  

Science Conference Proceedings (OSTI)

A dual-wavelength radar method to estimate snowfall rate has been developed. The method suggests taking simultaneous and collocated reflectivity measurements at two radar wavelengths. Snowfall backscattering at one of these wavelengths should be ...

Sergey Y. Matrosov

1998-11-01T23:59:59.000Z

204

International Weather-Radar Networking in Western Europe  

Science Conference Proceedings (OSTI)

During the last few years there has been considerable activity in Western Europe aimed at establishing national radar networks. Concurrent with this work, several bilateral agreements to exchange weather-radar data across national boundaries have ...

C. G. Collier; C. A. Fair; D. H. Newsome

1988-01-01T23:59:59.000Z

205

95-GHz Polarimetric Radar Measurements of Orographic Cap Clouds  

Science Conference Proceedings (OSTI)

The use of millimeter-wavelength radars for cloud microphysical research was investigated in experiments at the Elk Mountain Observatory near Laramie, Wyoming, between April 1990 and March 1992. The 95-GHz polarimetric radar used in these ...

Andrew Pazmany; James Mead; Robert McIntosh; Mark Hervig; Robert Kelly; Gabor Vali

1994-02-01T23:59:59.000Z

206

Gust Front Characteristics as Detected by Doppler Radar  

Science Conference Proceedings (OSTI)

Gust fronts produce low altitude wind shear that can be hazardous to aircraft operations, especially during takeoff and landing. Radar meteorologists have long been able to identify gust front signatures in Doppler radar data, but in order to use ...

Diana L. Klingle; David R. Smith; Marilyn M. Wolfson

1987-05-01T23:59:59.000Z

207

Comparison of Dual-Polarization Radar Estimators of Rain  

Science Conference Proceedings (OSTI)

Several polarimetric radar estimators of rain rate R and rainwater content M are examined. The accuracy of the estimators is analyzed using a gamma drop size distribution (DSD) simulation and a radar wavelength of 11 cm. The estimators that use ...

A. V. Ryzhkov; D. S. Zrni?

1995-04-01T23:59:59.000Z

208

On the Use of Radars for Operational Wind Profiling  

Science Conference Proceedings (OSTI)

The application of clear-air radars to operational wind profiling is considered. Several alternative techniques for determining atmospheric winds from radars are surveyed and, in light of the current interest in operational applications, the ...

B. B. Balsley; K. S. Gage

1982-09-01T23:59:59.000Z

209

The Effect of Radar Pulse Length on Cloud Reflectivity Statistics  

Science Conference Proceedings (OSTI)

When observing clouds with radars, there are a number of design parameters, such as transmitted power, antenna size, and wavelength, that can affect the detection threshold. In making calculations of radar thresholds, also known as minimum ...

Taneil Uttal; Robert A. Kropfli

2001-06-01T23:59:59.000Z

210

A Radar Study of the Plasma and Geometry of Lightning  

Science Conference Proceedings (OSTI)

Radar measurements and model studies are combined to investigate the plasma condition and the physical structure of lightning in thunderclouds. The lightning radar target is inferred to be an arclike plasma whose temperature exceeds 5000 K, ...

Earle R. Williams; Spiros G. Geotis; A. B. Bhattacharya

1989-05-01T23:59:59.000Z

211

Heating Profiles Derived From Cm-wavelength Radar During TWP...  

NLE Websites -- All DOE Office Websites (Extended Search)

Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Heating Profiles Derived From Cm-wavelength Radar During TWP-ICE Courtney Schumacher and Kaycee Frederick Courtney...

212

Tracking system for photon-counting laser radar  

E-Print Network (OSTI)

The purpose of this thesis is to build the tracking system for a photon-counting laser radar specifically a laser radar that has the ability to perform direct and coherent detection measurement at low signal levels with ...

Chang, Joshua TsuKang

2007-01-01T23:59:59.000Z

213

VHF and UHF Doppler Radars as Tools for Synoptic Research  

Science Conference Proceedings (OSTI)

Applications of VHF and UHF Doppler radars to research in synoptic meteorology are reviewed. We find that these radars show great potential for studies of large scales, but the area of research where the instruments really excel is in studying ...

M. F. Larsen; J. Röttger

1982-09-01T23:59:59.000Z

214

Mean Vertical Motions Seen by Radar Wind Profilers  

Science Conference Proceedings (OSTI)

Radar wind profilers have been used to measure directly the vertical motion above the radar site. Mean values of vertical motions in the troposphere and lower stratosphere reported at sites in and near mountains are often several centimeters per ...

G. D. Nastrom; T. E. VanZandt

1994-08-01T23:59:59.000Z

215

Estimation of Atmospheric Duct Structure Using Radar Sea Clutter  

Science Conference Proceedings (OSTI)

Retrieving atmospheric refractivity profiles from the sea surface backscattered radar clutter is known as the refractivity-from-clutter (RFC) technique. Because the relationship between refractivity and radar sea clutter is clearly nonlinear and ...

Zhao Xiaofeng; Huang Sixun

2012-09-01T23:59:59.000Z

216

The New French Operational Radar Rainfall Product. Part II: Validation  

Science Conference Proceedings (OSTI)

A new operational radar-based rainfall product has been developed at Météo-France and is currently being deployed within the French operational network. The new quantitative precipitation estimation (QPE) product is based entirely on radar data ...

P. Tabary; J. Desplats; K. Do Khac; F. Eideliman; C. Gueguen; J-C. Heinrich

2007-06-01T23:59:59.000Z

217

Procedures to Improve the Accuracy of Airborne Doppler Radar Data  

Science Conference Proceedings (OSTI)

The navigation correction method proposed in Testud et al. (referred to as the THL method) systematically identifies uncertainties in the aircraft Inertial Navigation System and errors in the radar-pointing angles by analyzing the radar returns ...

Brian L. Bosart; Wen-Chau Lee; Roger M. Wakimoto

2002-03-01T23:59:59.000Z

218

Estimating Urban Canopy Parameters Using Synthetic Aperture Radar Data  

Science Conference Proceedings (OSTI)

This paper introduces a remote sensing–based approach to rapidly derive urban morphological characteristics using radar satellite data. The approach is based on the expectation that the magnitude of the synthetic aperture radar (SAR) backscatter ...

Indumathi Jeyachandran; Steven J. Burian; Stephen W. Stetson

2010-04-01T23:59:59.000Z

219

Operational Monitoring of Radar Differential Reflectivity Using the Sun  

Science Conference Proceedings (OSTI)

A method for the daily monitoring of the differential reflectivity bias for polarimetric weather radars is presented. Sun signals detected in polar volume data produced during operational scanning of the radar are used. This method is an ...

Iwan Holleman; Asko Huuskonen; Rashpal Gill; Pierre Tabary

2010-05-01T23:59:59.000Z

220

Beam Multiplexing Using the Phased-Array Weather Radar  

Science Conference Proceedings (OSTI)

The recently installed S-band phased-array radar (PAR) at the National Weather Radar Testbed (NWRT) offers fast and flexible beam steering through electronic beam forming. This capability allows the implementation of a novel scanning strategy ...

Tian-You Yu; Marko B. Orescanin; Christopher D. Curtis; Dusan S. Zrni?; Douglas E. Forsyth

2007-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Dual-wavelength polarimetric radar analyses of tornadic debris signatures  

Science Conference Proceedings (OSTI)

Statistical properties of tornado debris signatures (TDSs) are investigated using S- and C-band polarimetric radar data with comparisons to damage surveys and satellite imagery. Close proximity of the radars to the 10 May 2010 Moore-Oklahoma City ...

David J. Bodine; Robert D. Palmer; Guifu Zhang

222

Weather Radar Polarimetry-Trends Toward Operational Applications  

Science Conference Proceedings (OSTI)

This is a version of a speech presented at the 27th Conference on Radar Meteorology. Relative advantages of polarimetry are contrasted with the advantages accrued by the introduction of radar into meteorology and by the addition of Doppler ...

Dušan S. Zrni?

1996-07-01T23:59:59.000Z

223

Coastal Oceanography Applications of Digital Image Data from Marine Radar  

Science Conference Proceedings (OSTI)

A marine radar attached to a digital image capture system has been adapted for deployment from shore sites. Optimum operating parameters have been identified in relation to the resolution and sampling capabilities of both the radar and the ...

I. S. Robinson; N. P. Ward; C. P. Gommenginger; M. A. Tenorio-Gonzales

2000-05-01T23:59:59.000Z

224

Evaluation of a 35 GHz Radar for Cloud Physics Research  

Science Conference Proceedings (OSTI)

A 1960 35 GHz radar has been modernized through the use of solid state electronics, Dopplerization and improved data-display capabilities. Radars of this frequency are particularly useful for observing the internal structures of clouds and for ...

Peter V. Hobbs; Nathan T. Funk; Richard R. Weiss Sr.; John D. Locatelli; Kumud R. Biswas

1985-03-01T23:59:59.000Z

225

Radar Observations of the 3 May 1999 Oklahoma City Tornado  

Science Conference Proceedings (OSTI)

The 3 May 1999 Oklahoma City storm is unique from a weather radar perspective because a long-track violent tornado passed within close range of several Doppler radars, because a detailed damage survey was conducted immediately after the event, ...

Donald W. Burgess; Michael A. Magsig; Joshua Wurman; David C. Dowell; Yvette Richardson

2002-06-01T23:59:59.000Z

226

Technology Maturity and Market Penetration Assessment  

Science Conference Proceedings (OSTI)

This report presents technology maturity curves and market penetration charts that were developed to assess the current and future state of development for a range of technologies. Technology maturity curves were developed for 17 technology categories covering the generation, transmission, and distribution of electricity and customer technologies. Market penetration charts were then developed for a subset of "game-changing" technologies to show the key steps to market entry for these technologies. Antici...

2012-07-10T23:59:59.000Z

227

EPRI Electric GSE Market Penetration Issues Round Table Proceedings: September 2001  

SciTech Connect

Due to the unfortunate incidents of September 11, 2001, the EPRI Electric GSE Market Penetration Issues Round Table Meeting scheduled to be held in Washington, D.C. was canceled. However, these meetings are vital to bring together the players in the electric ground support equipment industry that identify and address key issues surrounding the deployment of electric GSE. These meeting proceedings are the presentations that were to be used by the speakers of this meeting.

None

2001-11-01T23:59:59.000Z

228

Ionospheric modification experiments with satellite-borne and ground-based transmitters  

SciTech Connect

A research program is outlined to investigate the nonlinear VLF propagation and interaction with ionospheric plasmas with the satellite-borne and ground-based transmitters. Coordinated space and ground-based ionospheric modification experiments have been planned to study nonlinear propagation and mode conversion of VLF waves into lower hybrid waves in the presence of HF heater created ionospheric irregularities. Space experiments with the mother (ACTIVE)-daughter (CZAK) satellites are also discussed to examine the excitation of parametric instability by powerful VLF waves. Proposed ground-based radar, optical, and VLF measurements can provide effective diagnoses of the induced ionospheric effects. It is expected that electron acceleration caused by the lower hybrid waves will produce intense airglow emissions. In addition, a broad height distribution of enhanced plasma lines is also expected for radars to detect.

Lee, M.C.

1990-05-03T23:59:59.000Z

229

Cleareye In-Ground and In-Concrete DIV Inspections: FY11 Final Report  

DOE Green Energy (OSTI)

This report summarizes the results of a series of feasibility testing studies for in-ground and in-concrete imaging/detection technologies including radar imaging and acoustic time-of flight method. The objectives of this project are: (1) Design Information Verification (DIV) Tools for In-Concrete Inspections - To determine the feasibility of using holographic radar imaging (HRI), radar imaging, and acoustic time-of-flight (TOF) non-destructive evaluation technologies to detect, locate and identify pipes and voids embedded in standard-density and high-density concrete walls that typify those the IAEA will need to verify during field inspections; (2) DIV Tools for In-Ground Inspections - To determine the feasibility of using HRI and radar imaging non-destructive evaluation technologies to detect, locate, and identify objects buried at various depths made of various materials (metal, plastic, wood, and concrete) and representing geometries that typify those the IAEA will need to verify during field inspections; and (3) Based on the results of the studies, recommend the next steps needed to realize fieldable tools for in-concrete and in-ground inspections (including detection of deeply buried polyvinyl chloride [PVC] pipes) that employ the technologies shown to be feasible.

Braatz, Brett G.; Tedeschi, Jonathan R.; Denslow, Kayte M.; Morra, Marino; Knopik, Clint D.; Severtsen, Ronald H.; Jones, Anthony M.; Lechelt, Wayne M.; McMakin, Douglas L.; Good, Morris S.; Sorensen, Jerry B.; Hall, Thomas E.

2012-01-23T23:59:59.000Z

230

Adaptive Range Oversampling to Achieve Faster Scanning on the National Weather Radar Testbed Phased-Array Radar  

Science Conference Proceedings (OSTI)

This paper describes a real-time implementation of adaptive range oversampling processing on the National Weather Radar Testbed phased-array radar. It is demonstrated that, compared to conventional matched-filter processing, range oversampling can ...

Christopher D. Curtis; Sebastián M. Torres

2011-12-01T23:59:59.000Z

231

Can a VHF Doppler Radar Provide Synoptic Wind Data? A Comparison of 30 Days of Radar and Radiosonde Data  

Science Conference Proceedings (OSTI)

A number of experiments have shown that UHF and VHF Doppler radars can make “clear air” wind measurements in the troposphere and lower stratosphere, even in the presence of clouds and precipitation. Past comparisons of radar and rawinsonde ...

Miguel Folkmar Larsen

1983-10-01T23:59:59.000Z

232

Polarization Radar Measurements in Rain at 5 and 9 GHz  

Science Conference Proceedings (OSTI)

There is increased interest in dual-polarization radar measurements at 9 and 5 GHz not only for scientific reasons but also because such radars are less expensive to build and are easier to transport than 3-GHz S-band radars. Unfortunately, ...

A. R. Jameson

1991-11-01T23:59:59.000Z

233

Quality Assessment of Weather Radar Wind Profiles during Bird Migration  

Science Conference Proceedings (OSTI)

Wind profiles from an operational C-band Doppler radar have been combined with data from a bird tracking radar to assess the wind profile quality during bird migration. The weather radar wind profiles (WRWPs) are retrieved using the well-known ...

Iwan Holleman; Hans van Gasteren; Willem Bouten

2008-12-01T23:59:59.000Z

234

The New French Operational Polarimetric Radar Rainfall Rate Product  

Science Conference Proceedings (OSTI)

In 2012 the Météo France metropolitan operational radar network consists of 24 radars operating at C and S bands. In addition, a network of four X-band gap-filler radars is being deployed in the French Alps. The network combines polarimetric and ...

Jordi Figueras i Ventura; Pierre Tabary

2013-08-01T23:59:59.000Z

235

Lightning and radar observations of hurricane Rita landfall  

SciTech Connect

Los Alamos National Laboratory (LANL) owns and operates an array of Very-Low Frequency (VLF) sensors that measure the Radio-Frequency (RF) waveforms emitted by Cloud-to-Ground (CG) and InCloud (IC) lightning. This array, the Los Alamos Sferic Array (LASA), has approximately 15 sensors concentrated in the Great Plains and Florida, which detect electric field changes in a bandwidth from 200 Hz to 500 kHz (Smith et al., 2002). Recently, LANL has begun development of a new dual-band RF sensor array that includes the Very-High Frequency (VHF) band as well as the VLF. Whereas VLF lightning emissions can be used to deduce physical parameters such as lightning type and peak current, VHF emissions can be used to perform precise 3d mapping of individual radiation sources, which can number in the thousands for a typical CG flash. These new dual-band sensors will be used to monitor lightning activity in hurricanes in an effort to better predict intensification cycles. Although the new LANL dual-band array is not yet operational, we have begun initial work utilizing both VLF and VHF lightning data to monitor hurricane evolution. In this paper, we present the temporal evolution of Rita's landfall using VLF and VHF lightning data, and also WSR-88D radar. At landfall, Rita's northern eyewall experienced strong updrafts and significant lightning activity that appear to mark a transition between oceanic hurricane dynamics and continental thunderstorm dynamics. In section 2, we give a brief overview of Hurricane Rita, including its development as a hurricane and its lightning history. In the following section, we present WSR-88D data of Rita's landfall, including reflectivity images and temporal variation. In section 4, we present both VHF and VLF lightning data, overplotted on radar reflectivity images. Finally, we discuss our observations, including a comparison to previous studies and a brief conclusion.

Henderson, Bradley G [Los Alamos National Laboratory; Suszcynsky, David M [Los Alamos National Laboratory; Hamlin, Timothy E [Los Alamos National Laboratory; Jeffery, C A [Los Alamos National Laboratory; Wiens, Kyle C [TEXAS TECH U.; Orville, R E [TEXAS A& M

2009-01-01T23:59:59.000Z

236

Lightning and radar observations of hurricane Rita landfall  

SciTech Connect

Los Alamos National Laboratory (LANL) owns and operates an array of Very-Low Frequency (VLF) sensors that measure the Radio-Frequency (RF) waveforms emitted by Cloud-to-Ground (CG) and InCloud (IC) lightning. This array, the Los Alamos Sferic Array (LASA), has approximately 15 sensors concentrated in the Great Plains and Florida, which detect electric field changes in a bandwidth from 200 Hz to 500 kHz (Smith et al., 2002). Recently, LANL has begun development of a new dual-band RF sensor array that includes the Very-High Frequency (VHF) band as well as the VLF. Whereas VLF lightning emissions can be used to deduce physical parameters such as lightning type and peak current, VHF emissions can be used to perform precise 3d mapping of individual radiation sources, which can number in the thousands for a typical CG flash. These new dual-band sensors will be used to monitor lightning activity in hurricanes in an effort to better predict intensification cycles. Although the new LANL dual-band array is not yet operational, we have begun initial work utilizing both VLF and VHF lightning data to monitor hurricane evolution. In this paper, we present the temporal evolution of Rita's landfall using VLF and VHF lightning data, and also WSR-88D radar. At landfall, Rita's northern eyewall experienced strong updrafts and significant lightning activity that appear to mark a transition between oceanic hurricane dynamics and continental thunderstorm dynamics. In section 2, we give a brief overview of Hurricane Rita, including its development as a hurricane and its lightning history. In the following section, we present WSR-88D data of Rita's landfall, including reflectivity images and temporal variation. In section 4, we present both VHF and VLF lightning data, overplotted on radar reflectivity images. Finally, we discuss our observations, including a comparison to previous studies and a brief conclusion.

Henderson, Bradley G [Los Alamos National Laboratory; Suszcynsky, David M [Los Alamos National Laboratory; Hamlin, Timothy E [Los Alamos National Laboratory; Jeffery, C A [Los Alamos National Laboratory; Wiens, Kyle C [TEXAS TECH U.; Orville, R E [TEXAS A& M

2009-01-01T23:59:59.000Z

237

Towards the visualization of water supply system components with GPR images  

Science Conference Proceedings (OSTI)

We propose a methodological tool for examining the layout and revealing the concealed characteristics of urban water supply systems (WSS). For this purpose, we use underground images obtained with ground penetrating radar (GPR) as a method that does ... Keywords: Ground penetrating radar, Images processing and analysis, Pipe location, Signal processing

David Ayala-Cabrera; Manuel Herrera; Idel Montalvo; Rafael PéRez-GarcíA

2011-10-01T23:59:59.000Z

238

Multifrequency and multistatic inverse synthetic aperture radar, with application to FM passive radar  

Science Conference Proceedings (OSTI)

This paper deals with the imaging of a moving target using a multifrequency and multistatic radar consisting in one receiver and several narrowband transmitters. Considering two hypotheses about the studied target, we derive two multistatic inverse synthetic ...

Guillaume Ginolhac; Françoise Schmitt; Franck Daout; Philippe Forster

2010-01-01T23:59:59.000Z

239

Effects of Raindrop-Size Distribution Variation within the Radar Scattering Volume on Radar Observables  

Science Conference Proceedings (OSTI)

Dual linear polarization weather radars measure as primary observables the mean power P?H, and P?V, corresponding to returns at horizontal and vertical polarizations, respectively. Differential reflectivity ZDR is defined as the ratio between ...

G. Scarchilli; E. Gorgucci; T. A. Seliga; K. Aydin

1990-12-01T23:59:59.000Z

240

Discover the Benefits of Radar Imaging | Open Energy Information  

Open Energy Info (EERE)

Discover the Benefits of Radar Imaging Discover the Benefits of Radar Imaging Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Discover the Benefits of Radar Imaging Author William V. Parker Published EIJ Earth Imaging Journal, 2012 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Discover the Benefits of Radar Imaging Citation William V. Parker. Discover the Benefits of Radar Imaging [Internet]. 2012. N/A. EIJ Earth Imaging Journal. [updated 2013/09/20;cited 2013/09/20]. Available from: http://eijournal.com/2012/discover-the-benefits-of-radar-imaging GEOTHERMAL ENERGYGeothermal Home Web Site: Discover the Benefits of Radar imaging Details Abstract: Unavailable Author(s): William V. Parker Published: EIJ Earth Imaging Journal, 2012

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

The Evolution of Cloud-to-Ground Lightning within a Portion of the 10–11 June 1985 Squall Line  

Science Conference Proceedings (OSTI)

The character of cloud-to-ground lightning is examined during the life cycle of a distinct mesoscale segment of the 10–11 June 1985 mesoscale convective system (MCS). Three phases of lightning activity are identified and related to both the radar-...

K. E. Nielsen; R. A. Maddox; S. V. Vasiloff

1994-08-01T23:59:59.000Z

242

Atmospheric Soundings in Near-Real Time from Combined Satellite and Ground-Based Remotely Sensed Data  

Science Conference Proceedings (OSTI)

A mobile profiling system has been developed that is capable of probing the atmosphere from the surface to over 30 km. The Mobile Profiling System (MPS) combines ground-based instruments, including a five-beam 924-MHz radar wind profiler, a radio ...

James Cogan; Edward Measure; Daniel Wolfe

1997-10-01T23:59:59.000Z

243

Sunshot Initiative High Penetration Solar Portal  

DOE Data Explorer (OSTI)

The DOE SunShot Initiative is a collaborative national initiative to make solar energy cost-competitive with other forms of energy by the end of the decade. Reducing the installed cost of solar energy systems by about 75% will drive widespread large-scale adoption of this renewable energy and restore U.S. leadership in the global clean energy race. The High Penetration Solar Portal was created as a resource to aggregate the most relevant and timely information related to high penetration solar scenarios and integrating solar into the grid. The site is designed so that utilities, grant awardees, regulators, researchers, and other solar professionals can easily share data, case studies, lessons learned, and demonstration project findings. [copied from https://solarhighpen.energy.gov/about_the_high_penetration_solar_portal

244

METHOD AND APPARATUS FOR EARTH PENETRATION  

SciTech Connect

A nuclear reactor apparatus for penetrating into the earth's crust is described. The apparatus comprises a cylindrical nuclear core operating at a temperature that is higher than the melting temperature of rock. A high-density ballast member is coupled to the nuclear core such that the overall density of the core-ballast assembly is greater than the density of molten rock. The nuclear core is thermally insulated so that its heat output is constrained to flow axially, with radial heat flow being minimized. In operation, the apparatus is placed in contact with the earth's crust at the point desired to be penetrated. The heat output of the reactor melts the underlying rock, and the apparatus sinks through the resulting magma. The fuel loading of the reactor core determines the ultimate depth of crust penetration. (AEC)

Adams, W.M.

1963-12-24T23:59:59.000Z

245

Electrical grounding prong socket  

SciTech Connect

The invention is a socket for a grounding prong used in a three prong electrical plug and a receptacle for the three prong plug. The socket being sufficiently spacious to prevent the socket from significantly stretching when a larger, U-shaped grounding prong is inserted into the socket, and having a ridge to allow a snug fit when a smaller tubular shape grounding prong is inserted into the socket.

Leong, Robert (Dublin, CA)

1991-01-01T23:59:59.000Z

246

Predaceous Ground Beetles  

E-Print Network (OSTI)

Predaceous ground beetles can be a nuisance to homeowners, especially when they are numerous. This publication describes the beetles and discusses ways to prevent and treat them.

Sansone, Chris; Minzenmayer, Rick

2003-06-30T23:59:59.000Z

247

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 3, is a users manual and an installation and validation manual for the computer program SGSYS (Substation Grounding SYStem Analysis Program). This program analyzes the substation ground field given the total electric current injected into the ground field and the design of the grounding system. Standard outputs of the program are (1) total ground resistance, (2) step voltage, (3) touch voltage, (4) voltages on a grid of points, (5) voltage profile along straight lines, (6) transfer voltages, (7) ground potential rise, (8) body currents, (9) step voltage profile along straight lines, and (10) touch voltage profile along straight lines. This program can be utilized in an interactive or batch mode. In the interactive mode, the user defines the grounding system geometry, soil parameters, and output requests interactively, with the use of a user friendly conversational program. The users manual describes data requirements and data preparation procedures. An appendix provides forms which facilitate data collection procedures. The installation and validation manual describes the computer files which make up the program SGSYS and provides a test case for validation purposes.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

248

Transmitter passband requirements for imaging radar.  

SciTech Connect

In high-power microwave power amplifiers for radar, distortion in both amplitude and phase should generally be expected. Phase distortions can be readily equalized. Some amplitude distortions are more problematic than others. In general, especially for SAR using LFM chirps, low frequency modulations such as gain slopes can be tolerated much better than multiple cycles of ripple across the passband of the waveform.

Doerry, Armin Walter

2012-12-01T23:59:59.000Z

249

Insects Observed Using Dual-Polarization Radar  

Science Conference Proceedings (OSTI)

Two radars of different characteristics were used on a clear night in early summer to investigate the nature of the clear air echoes. It is deduced that most of the echoes on this evening were due to insects rather than atmospheric turbulence or ...

Eugene A. Mueller; Ronald P. Larkin

1985-03-01T23:59:59.000Z

250

A Typhoon Observed with the MU Radar  

Science Conference Proceedings (OSTI)

During the passage of Typhoon 8719 a 60-h continuous observation was made of the troposphere and the lower stratosphere with the MU (middle and upper atmosphere) radar. Height profiles of the wind velocity vector were measured every 2.5 min with ...

Toru Sato; Naoki Ao; Mamoru Yamamoto; Shoichiro Fukao; Toshitaka Tsuda; Susumu Kato

1991-03-01T23:59:59.000Z

251

Acoustic Radar Studies of Rain Microphysics  

Science Conference Proceedings (OSTI)

Raindrop size distributions are obtained from the Doppler frequency spectrum of an acoustic radar. Number concentrations of 12 drop diameters with a minimum diameter 0.14 cm are obtained and averaged over 3–15 min at 20-m range gates from 20 to ...

S. G. Bradley

1997-06-01T23:59:59.000Z

252

DOW Radar Observations of Wind Farms  

Science Conference Proceedings (OSTI)

The growth of the wind industry in recent years has motivated investigation into wind farm interference with the operation of the nationwide Weather Surveillance Radar-1988 Doppler (WSR-88D) network. Observations of a wind farm were taken with a Doppler ...

Mallie Toth; Erin Jones; Dustin Pittman; David Solomon

2011-08-01T23:59:59.000Z

253

Radar Measurement of Cooling Tower Drift  

Science Conference Proceedings (OSTI)

A method of radar measurement of drift, generated by the wet cooling towers of power plants, is proposed. The water given off by the evaporative towers consists of two kinds of droplets: the recondensation droplets—generally less than 20 ?m in ...

Henri Sauvageot

1989-09-01T23:59:59.000Z

254

Generating nonlinear FM chirp waveforms for radar.  

SciTech Connect

Nonlinear FM waveforms offer a radar matched filter output with inherently low range sidelobes. This yields a 1-2 dB advantage in Signal-to-Noise Ratio over the output of a Linear FM waveform with equivalent sidelobe filtering. This report presents design and implementation techniques for Nonlinear FM waveforms.

Doerry, Armin Walter

2006-09-01T23:59:59.000Z

255

Optical penetration sensor for pulsed laser welding  

SciTech Connect

An apparatus and method for determining the penetration of the weld pool created from pulsed laser welding and more particularly to an apparatus and method of utilizing an optical technique to monitor the weld vaporization plume velocity to determine the depth of penetration. A light source directs a beam through a vaporization plume above a weld pool, wherein the plume changes the intensity of the beam, allowing determination of the velocity of the plume. From the velocity of the plume, the depth of the weld is determined.

Essien, Marcelino (Albuquerque, NM); Keicher, David M. (Albuquerque, NM); Schlienger, M. Eric (Albuquerque, NM); Jellison, James L. (Albuquerque, NM)

2000-01-01T23:59:59.000Z

256

History of Residential Grounding  

Science Conference Proceedings (OSTI)

This report describes the development of residential electrical service grounding practices in the United States. The report focuses on the history of the National Electrical Code (NEC), which prescribes standards for wiring practices in residences, including grounding of the building electrical service.

2002-09-19T23:59:59.000Z

257

Ways of grounding imagination  

Science Conference Proceedings (OSTI)

This paper discusses and evaluates use of different participatory design methods in relation to addressing the challenge of grounding imagination. It presents reflections on the use of three participatory design methods, deployed in the WorkSpace project: ... Keywords: PD methods, analytical triangulation, bricolage, future laboratory, grounding imagination, in-situ prototyping experiments

Monika Büscher; Mette Agger Eriksen; Jannie Friis Kristensen; Preben Holst Mogensen

2004-07-01T23:59:59.000Z

258

SunShot Initiative: High Penetration Solar Deployment  

NLE Websites -- All DOE Office Websites (Extended Search)

High Penetration Solar Deployment High Penetration Solar Deployment to someone by E-mail Share SunShot Initiative: High Penetration Solar Deployment on Facebook Tweet about SunShot Initiative: High Penetration Solar Deployment on Twitter Bookmark SunShot Initiative: High Penetration Solar Deployment on Google Bookmark SunShot Initiative: High Penetration Solar Deployment on Delicious Rank SunShot Initiative: High Penetration Solar Deployment on Digg Find More places to share SunShot Initiative: High Penetration Solar Deployment on AddThis.com... Concentrating Solar Power Photovoltaics Systems Integration Research, Development, & Demonstration Competitive Awards Solar Utility Networks: Replicable Innovations in Solar Energy High Penetration Solar Deployment Grid Integration Advanced Concepts

259

Ground Motion Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

2nd Advanced ICFA Beam Dynamics Workshop 2nd Advanced ICFA Beam Dynamics Workshop on Ground Motion in Future Accelerators November 6 - 9, 2000 SLAC Coordinators: Andrei Seryi & Tor Raubenheimer Proceedings Updated June 26, 2001 Agenda and Presentations Workshop photos Summaries Useful links Poster Goals Introduction to the problems Structure Registration Registered participants Committees Location, Accommodations and Travel Workshop on Ground Motion in Future Accelerators A workshop was held at SLAC that was devoted to ground motion and its effects on future accelerators. Ground motion and vibration can be a limiting effect in synchrotron light sources, hadron circular colliders, and electron/positron linear colliders. Over the last several years, there has been significant progress in the understanding of the ground motion and its effects, however, there are

260

Scale Dependence of Radar Rainfall Uncertainty: Initial Evaluation of NEXRAD’s New Super-Resolution Data for Hydrologic Applications  

Science Conference Proceedings (OSTI)

This study explores the scale effects of radar rainfall accumulation fields generated using the new super-resolution level II radar reflectivity data acquired by the Next Generation Weather Radar (NEXRAD) network of the Weather Surveillance Radar-...

Bong-Chul Seo; Witold F. Krajewski

2010-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Vertical Velocity and Buoyancy Characteristics of Coherent Echo Plumes in the Convective Boundary Layer, Detected by a Profiling Airborne Radar  

Science Conference Proceedings (OSTI)

Aircraft and airborne millimeter-wave radar observations are used to interpret the dynamics of radar echoes and radar-inferred updrafts within the well-developed, weakly sheared continental convective boundary layer. Vertically pointing radar ...

Qun Miao; Bart Geerts; Margaret LeMone

2006-06-01T23:59:59.000Z

262

METHOD OF LOCATING GROUNDS  

DOE Patents (OSTI)

ABS>This patent presents a method for locating a ground in a d-c circult having a number of parallel branches connected across a d-c source or generator. The complete method comprises the steps of locating the ground with reference to the mildpoint of the parallel branches by connecting a potentiometer across the terminals of the circuit and connecting the slider of the potentiometer to ground through a current indicating instrument, adjusting the slider to right or left of the mildpoint so as to cause the instrument to indicate zero, connecting the terminal of the network which is farthest from the ground as thus indicated by the potentiometer to ground through a condenser, impressing a ripple voltage on the circuit, and then measuring the ripple voltage at the midpoint of each parallel branch to find the branch in which is the lowest value of ripple voltage, and then measuring the distribution of the ripple voltage along this branch to determine the point at which the ripple voltage drops off to zero or substantially zero due to the existence of a ground. The invention has particular application where a circuit ground is present which will disappear if the normal circuit voltage is removed.

Macleish, K.G.

1958-02-11T23:59:59.000Z

263

ARM - Field Campaign - 2001 Multi-Frequency Radar IOP  

NLE Websites -- All DOE Office Websites (Extended Search)

govCampaigns2001 Multi-Frequency Radar IOP govCampaigns2001 Multi-Frequency Radar IOP Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Campaign : 2001 Multi-Frequency Radar IOP 2001.03.01 - 2001.09.30 Lead Scientist : Stephen Sekelsky Data Availability http://abyss.ecs.umass.edu For data sets, see below. Summary Install UMass and NOAA Aeronomy Laboratory "guest instrument" radars at the SGP CART site adjacent to the MMCR system. Both the UMass and NOAA Aeronomy Laboratory systems will run autonomously for approximately a six month period. Description Scientific hypothesis: A. Measurements from the University of Massachusetts (UMass) Cloud Profiling Radar System (CPRS) - 95/33 GHz Radar indicate that the 95 GHz channel is much less sensitive to insect clutter than the 35 GHz channel by

264

Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) |  

Open Energy Info (EERE)

Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Author Parviz Tarikhi Published N/A, 2010 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) Citation Parviz Tarikhi. Synthetic Aperture Radar Persistent Scatterer Interferometry (PSInSAR) [Internet]. 2010. Tunis, Tunisia. N/A. [cited 2013/09/17]. Available from: http://parviztarikhi.files.wordpress.com/2010/05/3psinsar-i-parviz_tarikhi.pdf Retrieved from "http://en.openei.org/w/index.php?title=Synthetic_Aperture_Radar_Persistent_Scatterer_Interferometry_(PSInSAR)&oldid=682949"

265

An Evaluation of a 94-GHz Radar for Remote Sensing of Cloud Properties  

Science Conference Proceedings (OSTI)

The performance of a 94-GHz radar is evaluated for a variety of cloud conditions. Descriptions of the radar hardware, signal processing, and calibration provide an overview of the radar's capabilities. An important component of the signal ...

E. E. Clothiaux; M. A. Miller; B. A. Albrecht; T. P. Ackerman; J. Verlinde; D. M. Babb; R. M. Peters; W. J. Syrett

1995-04-01T23:59:59.000Z

266

Eddy Dissipation Rates in Thunderstorms Estimated by Doppler Radar in Relation to Aircraft In Situ Measurements  

Science Conference Proceedings (OSTI)

High-resolution aircraft turbulence measurements, well coordinated with radar Doppler spectral width measurements, have been used to verify radar-estimated energy dissipation rates within thunderstorms anvils. The radar-estimated eddy dissipation ...

Peter Meischner; Robert Baumann; Hartmut Höller; Thomas Jank

2001-10-01T23:59:59.000Z

267

A Solo-based automated quality control algorithm for airborne tail Doppler radar data  

Science Conference Proceedings (OSTI)

An automated quality control pre-processing algorithm for removing non-weather radar echoes in airborne Doppler radar data has been developed. This algorithm can significantly reduce the time and experience level required for interactive radar ...

Michael M. Bell; Wen-Chau Lee; Cory A. Wolff; Huaqing Cai

268

Estimating Rainfall Intensities from Weather Radar Data: The Scale-Dependency Problem  

Science Conference Proceedings (OSTI)

Meteorological radar is a remote sensing system that provides rainfall estimations at high spatial and temporal resolutions. The radar-based rainfall intensities (R) are calculated from the observed radar reflectivities (Z). Often, rain gauge ...

Efrat Morin; Witold F. Krajewski; David C. Goodrich; Xiaogang Gao; Soroosh Sorooshian

2003-10-01T23:59:59.000Z

269

An Early Performance Evaluation of the NEXRAD Dual Polarization Radar Rainfall Estimates for Urban Flood Applications  

Science Conference Proceedings (OSTI)

Dual polarization radars are expected to provide better rainfall estimates than single polarization radars due to their ability to characterize hydrometeor type. The goal of this study is to evaluate single and dual polarization radar rainfall ...

Luciana K. Cunha; James A. Smith; Mary Lynn Baeck; Witold F. Krajewski

270

Hail Detection Using S- and C-Band Radar Reflectivity Difference  

Science Conference Proceedings (OSTI)

In reflectivity fields observed with conventional radar networks, hailstorm identification is not easy. In the present paper, a hailstorm detection method using two single-wavelength radars located far from each other is discussed. The two radars,...

Laurent Féral; Henri Sauvageot; Serge Soula

2003-02-01T23:59:59.000Z

271

An Experimental Study of Small-Scale Variability of Radar Reflectivity Using Disdrometer Observations  

Science Conference Proceedings (OSTI)

Analysis of data collected by four disdrometers deployed in a 1-km2 area is presented with the intent of quantifying the spatial variability of radar reflectivity at small spatial scales. Spatial variability of radar reflectivity within the radar ...

Benjamin J. Miriovsky; A. Allen Bradley; William E. Eichinger; Witold F. Krajewski; Anton Kruger; Brian R. Nelson; Jean-Dominique Creutin; Jean-Marc Lapetite; Gyu Won Lee; Isztar Zawadzki; Fred L. Ogden

2004-01-01T23:59:59.000Z

272

Effects of Radar Sampling on Single-Doppler Velocity Signatures of Mesocyclones and Tornadoes  

Science Conference Proceedings (OSTI)

Simulated WSR-88D (Weather Surveillance Radar-1988 Doppler) radar data were used to investigate the effects of discrete azimuthal sampling on Doppler velocity signatures of modeled mesocyclones and tornadoes at various ranges from the radar and ...

Vincent T. Wood; Rodger A. Brown

1997-12-01T23:59:59.000Z

273

Bollène-2002 Experiment: Radar Quantitative Precipitation Estimation in the Cévennes–Vivarais Region, France  

Science Conference Proceedings (OSTI)

The Bollène-2002 Experiment was aimed at developing the use of a radar volume-scanning strategy for conducting radar rainfall estimations in the mountainous regions of France. A developmental radar processing system, called Traitements ...

Guy Delrieu; Brice Boudevillain; John Nicol; Benoît Chapon; Pierre-Emmanuel Kirstetter; Hervé Andrieu; D. Faure

2009-07-01T23:59:59.000Z

274

Development of a Drillrod/Telemetry Radar  

Science Conference Proceedings (OSTI)

Efficient extraction of deeply buried natural resources is dependent upon accurate geologic models. The model becomes the basis for developing plans for extraction of the resource. Geoscientists working in geothermal and hydrocarbon recovery have a great deal in common with fellow geoscientists working in the mining industry. They appreciate the intractable problem of increasing the depth of investigation to tens of meters from the wellbore. The goal of this project was to develop a borehole radar tool to acquire data within tens of meters from the wellbore. For geothermal and hydrocarbon applications, the tool was to acquire data for mapping fractures surrounding the wellbore. In mining of coal, the radar acquires data for determining coal seam thickness and detecting geologic anomalies ahead of mining.

Raton Technology Research, Inc.

1999-11-12T23:59:59.000Z

275

Deploying High Penetration Photovoltaic Systems: A Case Study  

DOE Green Energy (OSTI)

Photovoltaic (PV) system capacity penetration, or simply 'penetration,' is often defined as the rated power output of the aggregate PV systems on a distribution circuit segment divided by the peak load of that circuit segment. Industry experts agree that a single value defining high penetration is not universally applicable. However, it is generally agreed that a conservative value to designate high penetration is the condition when the ratio of aggregate PV systems ratings to peak load exceeds 15%. This case study illustrates the case of a distribution feeder which is able to accommodate a traditional capacity penetration level of 47%, and perhaps more. New maximum penetration levels need to be defined and verified and enhanced definitions for penetration on a distribution circuit need to be developed. The new penetration definitions and studies will help utility engineers, system developers, and regulatory agencies better agree what levels of PV deployment can be attained without jeopardizing the reliability and power quality of a circuit.

Coddington, M. H.; Baca, D.; Kroposki, B. D.; Basso, T.

2011-01-01T23:59:59.000Z

276

Inversion of synthetic aperture radar interferograms for sources...  

Open Energy Info (EERE)

Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Jump to: navigation, search OpenEI Reference...

277

Ka-Band ARM Zenith Radar (KAZR) Instrument Handbook  

SciTech Connect

The Ka-band ARM zenith radar (KAZR) is a zenith-pointing Doppler cloud radar operating at approximately 35 GHz. The KAZR is an evolutionary follow-on radar to ARM's widely successful millimeter-wavelength cloud radar (MMCR). The main purpose of the KAZR is to provide vertical profiles of clouds by measuring the first three Doppler moments: reflectivity, radial Doppler velocity, and spectra width. At the sites where the dual-polarization measurements are made, the Doppler moments for the cross-polarization channel are also available. In addition to the moments, velocity spectra are also continuously recorded for each range gate.

Widener, K; Bharadwaj, N; Johnson, K

2012-03-06T23:59:59.000Z

278

Forthcoming Upgrades to the ARM MMCRs: Improved Radar Processor...  

NLE Websites -- All DOE Office Websites (Extended Search)

Improved Radar Processor and Dual-Polarization K. P. Moran, B. E. Martner, and K. A. Clark National Oceanic and Atmospheric Administration Environmental Technology Laboratory...

279

Argonne radar meteorologist Scott Collis named one of Popular...  

NLE Websites -- All DOE Office Websites (Extended Search)

Physical Sciences from the Australian National University in 2007. Click to enlarge. Argonne radar meteorologist Scott Collis named one of Popular Science's 'Brilliant 10' By...

280

What is Synthetic Aperture Radar? -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

What is Synthetic Aperture Radar? Environmental monitoring, earth-resource mapping, and military systems require broad-area imaging at high resolutions. Many times the imagery must...

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Substation Grounding Grids  

Science Conference Proceedings (OSTI)

This report is an account of research performed by the Electric Power Research Institute (EPRI) in 2011 on the subject of degradation of buried grounding grids in electric power substations. Substation ground grids are usually made of copper conductors, which are placed below grade and are joined together and to the above-grade structures with various types of connectors. While above-grade connections are visible and may be inspected, below-grade connections are not visible or readily accessible for insp...

2011-12-22T23:59:59.000Z

282

EPRI Substation Grounding Project  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) has been conducting research in the area of substation grounding and fault current management for several decades. This research has resulted in a large number of reports and other products. To help users locate the results of EPRI’s research in substation grounding and fault current management, an annual update is prepared containing brief descriptions of the products.ObjectiveThe objective of this report is ...

2012-09-06T23:59:59.000Z

283

Market penetration of new energy technologies  

SciTech Connect

This report examines the characteristics, advantages, disadvantages, and, for some, the mathematical formulas of forecasting methods that can be used to forecast the market penetration of renewable energy technologies. Among the methods studied are subjective estimation, market surveys, historical analogy models, cost models, diffusion models, time-series models, and econometric models. Some of these forecasting methods are more effective than others at different developmental stages of new technologies.

Packey, D.J.

1993-02-01T23:59:59.000Z

284

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 2, is a users manual and an installation and validation manual for the computer program SMECC (Substation Maximum Earth Current Computation Program). This program analyzes the electric current distribution among grounded structures inside and outside a substation for different fault conditions. The fault conditions are automatically selected by the program, or they may be specified by the user, or both. The fault condition resulting in maximum substation earth current is identified and reported. Data requirements for this program are: ground impedance, transformer data, transmission line data, transmission line grounding impedances, etc. The program provides four types of standard outputs: (1) a report of voltages and current flow in the unfaulted system, (2) a brief report of the maximum ground potential rise (worst fault condition), (3) a summary report of all fault conditions which have been analyzed by the program, and (4) a detailed report of voltages and current flow for a selected set of fault conditions.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

285

Characteristics of the Raindrop Size Distribution and Drop Shape Relation in Typhoon Systems in the Western Pacific from the 2D Video Disdrometer and NCU C-Band Polarimetric Radar  

Science Conference Proceedings (OSTI)

The drop size distribution (DSD) and drop shape relation (DSR) characteristics that were observed by a ground-based 2D video disdrometer and retrieved from a C-band polarimetric radar in the typhoon systems during landfall in the western Pacific, ...

Wei-Yu Chang; Tai-Chi Chen Wang; Pay-Liam Lin

2009-10-01T23:59:59.000Z

286

Value of storage with increased renewable penetration.  

Science Conference Proceedings (OSTI)

The problem statement for this project is: (1) Renewable energy portfolio standards - (a) high penetration of intermittent and variable renewable generation on the grid, (b) utilities constrained by NERC Control Performance Standards, (c) requires additional resources to match generation with load; and (2) mitigation of impacts with energy storage - at what level of renewable penetration does energy storage become an attractive value proposition. Use a simplified, yet robust dispatch model that: (a) incorporates New Mexico Balance Area load and wind generation data, (b) distributes the load among a suite of generators, (c) quantifies increased generation costs with increased penetration of intermittent and variable renewable generation - fuel, startup, shut down, ramping, standby, etc., (d) tracks and quantifies NERC pentalties and violations, and (e) quantifies storage costs. Dispatch model has been constructed and it: (a) accurately distributes a load among a suite of generators, (b) quantifies duty cycle metrics for each of the generators - cumulative energy production, ramping and non ramping duration, spinning reserves, number of start-ups, and shut down durations, etc., (c) quantifies energy exchanges - cumulative exchanges, duration, and number of exchanges, (d) tracks ACE violations.

Brainard, James Robert; Roach, Jesse Dillon

2010-10-01T23:59:59.000Z

287

Guide for Transmission Line Grounding  

Science Conference Proceedings (OSTI)

Electrical utilities have a duty to provide effective grounding for managing steady-state and fault currents, whether near a large generating station or at a remote distribution pole ground. For transmission lines, this imperative is usually met with investment in overhead ground wires and grounding electrodes. Effective grounding at each tower improves reliability8212by providing low path impedance to lightning strokes8212and contributes to safety. However, the fundamental physical parameters in ground ...

2007-12-20T23:59:59.000Z

288

Distribution System Analysis Tools for Studying High Penetration of PV  

E-Print Network (OSTI)

Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support Features Electric Energy System #12;#12;Distribution System Analysis Tools for Studying High Penetration of PV project titled "Distribution System Analysis Tools for Studying High Penetration of PV with Grid Support

289

Thunderstorm lightning and radar characteristics: insights on electrification and severe weather forecasting  

E-Print Network (OSTI)

Total lightning mapping, along with radar and NLDN cloud-to-ground lightning data, can be used to diagnose the severity of a storm. Analysis of the 13 October 2001 supercell event (Dallas-Fort Worth, Texas), some supercells of which were tornadic, shows that LDAR II lightning source heights (quartile, median, and 95th percentile heights) increased as the storms intensified. Most of the total lightning occurred where reflectivity cores extended upwards and within regions of reflectivity gradient rather than in reflectivity cores. A total lightning hole was associated with an intense, nontornadic supercell on 6 April 2003. This feature was nonexistent from all supercells analyzed during the 13 October case. During tornadogenesis, the radar and LDAR II data indicated updraft weakening. The height of the 30 dBZ radar top began to descend approximately 10 minutes (2 volume scans) before tornado touchdown in one storm. Total lightning and CG flash rates decreased by up to a factor of 5 to a minimum during an F2 tornado touchdown associated with this storm. LDAR II source heights all showed descent by 2-4 km during a 25 minute period prior to and during this tornado touchdown. This drastic trend of decreasing source heights was observed in two tornadic storms prior to and during tornado touchdown, but did not occur in non-tornadic supercells, suggesting that these parameters can be useful to forecasters. These observations agree with tornadogenesis theory that an updraft weakens and the mesocyclone can become divided (composed of both updraft and downdraft) when a storm becomes tornadic. LDAR II source density contours were comma-shaped in association with severe wind events within mesoscale convective systems (MCSs) on 13 October 2001 and 27 May 2002. This signature is similar to the radar reflectivity bow echo. Consistent relationships between severe weather, radar and lightning storm characteristics (i.e., lightning heights) were not found for cells within MCSs as was the case for supercells. Cell interactions within MCSs are believed to weaken these relationships as reflectivity and lightning from nearby storms contaminate the cells of interest. It is also more difficult to clearly define a cell within an MCS.

Steiger, Scott Michael

2005-12-01T23:59:59.000Z

290

Computer-aided modeling of superconducting striplines with ground planes using critical state models  

E-Print Network (OSTI)

for publication 29 May 2001 The effect of ground planes on the current-induced critical states and flux and the field and current distribution10,11 and the surface impedance from hysteretic loss4 was obtained penetration for a thin superconducting strip carrying a microwave current has been calculated numerically

Sridhar, Srinivas

291

Wideband Waveform Design Principles for Solid-State Weather Radars  

Science Conference Proceedings (OSTI)

The use of solid-state transmitters is becoming increasingly viable for atmospheric radars and is a key part of the strategy to realize any dense network of low-powered radars. However, solid-state transmitters have low peak powers and this ...

Nitin Bharadwaj; V. Chandrasekar

2012-01-01T23:59:59.000Z

292

Detailed Observations of Wind Turbine Clutter with Scanning Weather Radars  

Science Conference Proceedings (OSTI)

The wind power industry has seen tremendous growth over the past decade and with it has come the need for clutter mitigation techniques for nearby radar systems. Wind turbines can impart upon these radars a unique type of interference that is not ...

B. M. Isom; R. D. Palmer; G. S. Secrest; R. D. Rhoton; D. Saxion; T. L. Allmon; J. Reed; T. Crum; R. Vogt

2009-05-01T23:59:59.000Z

293

A 35-GHz Scanning Doppler Radar for Fog Observations  

Science Conference Proceedings (OSTI)

To observe fog, a 35-GHz scanning Doppler radar was designed, assembled, and tested. The radar, mounted on a flatbed vehicle for portability, transmits peak powers of 100 kW in a pulse of 0.5-µs width and a beamwidth of 0.3°. Thus, a reflectivity ...

Kyosuke Hamazu; Hiroyuki Hashiguchi; Toshio Wakayama; Tomoya Matsuda; Richard J. Doviak; Shoichiro Fukao

2003-07-01T23:59:59.000Z

294

Radar Nowcasting of Total Lightning over the Kennedy Space Center  

Science Conference Proceedings (OSTI)

A long-term radar dataset over Melbourne, Florida, was matched with three-dimensional lightning data to optimize radar-derived predictors of total lightning over the Kennedy Space Center (KSC). Four years (2006–09) of summer (June–August) daytime (...

Gregory N. Seroka; Richard E. Orville; Courtney Schumacher

2012-02-01T23:59:59.000Z

295

A Description of the CSU–CHILL National Radar Facility  

Science Conference Proceedings (OSTI)

The subject of this paper is the Colorado State University–University of Chicago–Illinois State Water Survey (CSU–CHILL) National Radar Facility’s S-band polarimetric research radar. Key features of this system include polarization agility (...

David Brunkow; V. N. Bringi; Patrick C. Kennedy; Steven A. Rutledge; V. Chandrasekar; E. A. Mueller; Robert K. Bowie

2000-12-01T23:59:59.000Z

296

A Robust Dual-Frequency Radar Profiling Algorithm  

Science Conference Proceedings (OSTI)

In this study, an algorithm to retrieve precipitation from spaceborne dual-frequency (13.8 and 35.6 GHz, or Ku/Ka band) radar observations is formulated and investigated. Such algorithms will be of paramount importance in deriving radar-based and ...

Mircea Grecu; Lin Tian; William S. Olson; Simone Tanelli

2011-07-01T23:59:59.000Z

297

Radio Acoustic Sounding with a UHF Volume Imaging Radar  

Science Conference Proceedings (OSTI)

An implementation of a radio acoustic sounding system (RASS) using a UHF volume imaging radar is presented. The volume-imaging ability of the radar permits the study the spatial structure of the RASS echo observing both the diffraction pattern on ...

Paco López Dekker; Stephen J. Frasier

2004-05-01T23:59:59.000Z

298

Ultrawideband radar clutter measurements of forested terrain, 1991--1992  

Science Conference Proceedings (OSTI)

The ultrawideband (UWB) radar clutter measurements project was conducted to provide radar clutter data for new ultrawideband radar systems which are currently under development. A particular goal of this project is to determine if conventional narrow band clutter data may be extrapolated to the UWB case. This report documents measurements conducted in 1991 and additional measurements conducted in 1992. The original project consisted of clutter measurements of forested terrain in the Olympic National Forest near Sequim, WA. The impulse radar system used a 30 kW peak impulse source with a 2 Gigasample/second digitizer to form a UHF (300--1000 MHz) ultrawideband impulse radar system. Additional measurements were conducted in parallel using a Systems Planning Corporation (SPC) step-chirp radar system. This system utilized pulse widths of 1330 nanoseconds over a bandwidth of 300--1000 MHz to obtain similar resolution to the impulse system. Due to the slow digitizer data throughput in the impulse radar system, data collection rates were significantly higher using the step-chirp system. Additional forest clutter measurements were undertaken in 1992 to increase the amount of data available, and especially to increase the amount of data from the impulse radar system.

Sheen, D.M.; Severtsen, R.H.; Prince, J.M.; Davis, K.C.; Collins, H.D.

1993-06-01T23:59:59.000Z

299

Radar-cross-section reduction of wind turbines. part 1.  

SciTech Connect

In recent years, increasing deployment of large wind-turbine farms has become an issue of growing concern for the radar community. The large radar cross section (RCS) presented by wind turbines interferes with radar operation, and the Doppler shift caused by blade rotation causes problems identifying and tracking moving targets. Each new wind-turbine farm installation must be carefully evaluated for potential disruption of radar operation for air defense, air traffic control, weather sensing, and other applications. Several approaches currently exist to minimize conflict between wind-turbine farms and radar installations, including procedural adjustments, radar upgrades, and proper choice of low-impact wind-farm sites, but each has problems with limited effectiveness or prohibitive cost. An alternative approach, heretofore not technically feasible, is to reduce the RCS of wind turbines to the extent that they can be installed near existing radar installations. This report summarizes efforts to reduce wind-turbine RCS, with a particular emphasis on the blades. The report begins with a survey of the wind-turbine RCS-reduction literature to establish a baseline for comparison. The following topics are then addressed: electromagnetic model development and validation, novel material development, integration into wind-turbine fabrication processes, integrated-absorber design, and wind-turbine RCS modeling. Related topics of interest, including alternative mitigation techniques (procedural, at-the-radar, etc.), an introduction to RCS and electromagnetic scattering, and RCS-reduction modeling techniques, can be found in a previous report.

Brock, Billy C.; Loui, Hung; McDonald, Jacob J.; Paquette, Joshua A.; Calkins, David A.; Miller, William K.; Allen, Steven E.; Clem, Paul Gilbert; Patitz, Ward E.

2012-03-05T23:59:59.000Z

300

The Measurement of Precipitation with Synthetic Aperture Radar  

Science Conference Proceedings (OSTI)

The radar equation for the measurement of precipitation by SAR is identical to that for a conventional radar. The achievable synthetic beamwidth, ?s, is proportional to ?v/U, the ratio of the spread of the precipitation Doppler spectrum to the ...

David Atlas; Richard K. Moore

1987-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

High-Frequency Skywave Radar Track of Tropical Storm Debra  

Science Conference Proceedings (OSTI)

Tropical Storm Debra was tracked over a 31 h period in the Gulf of Mexico using the Wide Aperture Research Facility (WARF) high-frequency (HF) skywave radar in California. In contrast to the first WARF skywave radar tracking experiment in which ...

Joseph W. Maresca Jr.; Christopher T. Carlson

1981-04-01T23:59:59.000Z

302

The Distribution of Rainfall over Oceans from Spaceborne Radars  

Science Conference Proceedings (OSTI)

A combination of rainfall estimates from the 13.8-GHz Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) and the 94-GHz CloudSat Cloud Profiling Radar (CPR) is used to assess the distribution of rainfall intensity over tropical ...

Wesley Berg; Tristan L’Ecuyer; John M. Haynes

2010-03-01T23:59:59.000Z

303

Substation grounding programs  

SciTech Connect

This document is a users manual and applications guide for the software package SGA. This package comprises four computer programs, namely SOMIP, SMECC, SGSYS, and TGRND. The first three programs are analysis models which are to be used in the design process of substation grounding systems. The fourth program, TGRND, is an analysis program for determining the transient response of a grounding system. This report, Volume 5, is an applications guide of the three computer programs. SOMIP, SMECC, and SGSYS, for the purpose of designing a safe substation grounding system. The applications guide utilizes four example substation grounding systems for the purpose of illustrating the application of the programs, SOMIP, SMECC, and SGSYS. The examples are based on data provided by four contributing utilities, namely, Houston Lighting and Power Company, Southern Company Services, Puget Sound Power and Light Company, and Arizona Public Service Company. For the purpose of illustrating specific capabilities of the computer programs, the data have been modified. As a result, the final designs of the four systems do not necessarily represent actual grounding system designs by these utilities. The example system 1 is a 138 kV/35 kV distribution substation. The example system 2 is a medium size 230 kV/115 kV transmission substation. The third example system is a generation substation while the last is a large 525 kV/345 kV/230 kV transmission substation. The four examples cover most of the practical problems that a user may encounter in the design of substation grounding systems.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). Electric Power Lab.)

1992-05-01T23:59:59.000Z

304

Substation Ground Grid Impedance Measurement  

Science Conference Proceedings (OSTI)

Because safety impacts all segments of the electric power industry, the integrity and conformance to standards of substation grounding systems is of paramount importance. This report summarizes field demonstrations of commercially available meters for performance evaluation of large grounding systems, including the EPRI Ground Grid Evaluator (commercially known as the Smart Ground Multimeter or SGM).

2007-12-13T23:59:59.000Z

305

Penetration through a wall: Is it reality?  

E-Print Network (OSTI)

A tennis ball is not expected to penetrate through a brick wall since a motion under a barrier is impossible in classical mechanics. With quantum effects a motion of a particle through a barrier is allowed due to quantum tunneling. According to usual theories of tunneling, the particle density decays inside a classical barrier resulting in an extremely slow pentration process. However, there are no general laws forbidding fast motion through classical barriers. The problem addressed is investigation of unusual features o quantum tunneling through a classic static barrier which is at least two-dimensional. Here we show that penetration through such barrier can be not slow. When the barrier satisfies the certain conditions, a regime of quantum lens is possible with formation of caustics. De Broglie waves are reflected from the caustics, interfere, and result in a not small flux from under the barrier. This strongly contrasts to the usual scenario with a decaying under-barrier density. We construct a particular example of fast motion through a classical barrier. One can unexectedly conclude that, in principle, nature allows fast penetration through classical barriers which against common sense. The phenomenon may be responsible for a variety of processes in labs and nature. For example, tunneling in solids may occur with a different scenario, in biophysics and chemistry one can specify conditions for unusual reactions, and evanescent optical waves may strongly change their properties. In condensed matter and cosmic physics there are phenomena with misterious reasons of an energy emission, for instance, gamma-ray bursts. One can try to treat them in the context of fast escape from under some barriers.

B. Ivlev

2011-08-25T23:59:59.000Z

306

W-Band ARM Cloud Radar - Specifications and Design  

NLE Websites -- All DOE Office Websites (Extended Search)

W-Band ARM Cloud Radar - Specifications and Design W-Band ARM Cloud Radar - Specifications and Design K. B. Widener Pacific Northwest National Laboratory Richland, Washington J. B. Mead ProSensing, Inc. Amherst, Massachusetts Abstract The Atmospheric Radiation Measurement (ARM) Program and ProSensing, Inc. have teamed to develop and deploy the W-band ARM Cloud Radar (WACR) at the SGP central facility. The WACR will be co- located with the ARM millimeter wave cloud radar (MMCR) with planned operation to begin in early 2005. This radar will complement the measurements of the MMCR and will aid in filtering out insect contamination in the data. In this poster we present the design goals, expected performance characteristics, and the detailed design for the WACR. Introduction The MMCR has been operating at the Southern Great Plains (SGP) site since 1998. It has proven to be

307

Inversion of synthetic aperture radar interferograms for sources of  

Open Energy Info (EERE)

Inversion of synthetic aperture radar interferograms for sources of Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Authors Bill Foxall and D. W. Vasco Published Journal Journal of Volcanology and Geothermal Research, 2008 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie Valley geothermal field Citation Bill Foxall,D. W. Vasco. 2008. Inversion of synthetic aperture radar interferograms for sources of production-related subsidence at the Dixie

308

Synthetic Aperture Radar Movie Gallery -- Sandia National Laboratories  

NLE Websites -- All DOE Office Websites (Extended Search)

Synthetic Aperture Radar Movie Gallery Synthetic Aperture Radar Movie Gallery This gallery features movies of Sandia National Laboratories' synthetic aperture radar imagery of Albuquerque, New Mexico and Washington, DC. Sandia's Twin-Otter SAR produced these high-resolution stripmap images in real time. (Note: The movies below have been downsampled greatly to make them suitable for viewing on the world wide web. These movies are not recommended for modems of speeds less than 56 kbps due to their large file sizes.) Albuquerque, NM Area Movies Sandia National Laboratories' Twin-Otter SAR produced these Ku-Band 0.3 and 1.0 meter resolution images of Albuquerque, NM in real time. Synthetic aperture radar movie of west Gibson Blvd 0.3 meter airborne synthetic aperture radar movie from I-25 to Maxwell along Gibson Blvd. (Length: 30 seconds)

309

PATTERN: Advantages of High Resolution Weather Radar Networks [EVS Event]  

NLE Websites -- All DOE Office Websites (Extended Search)

PATTERN: Advantages of High Resolution Weather Radar Networks PATTERN: Advantages of High Resolution Weather Radar Networks September 30, 2013 Speaker: Dr. Katharina Lengfeld Meteorological Institute, University of Hamburg, Germany Date: Monday, September 30, 2013 Time: 11 am - 12 noon Location: Argonne National Laboratory TCS Building 240 Room 4301 Precipitation observations with radars operating in the X-band frequency range are essential for meeting present and future requirements for flood forecasting, water management, and other hydro-meteorological applications. Besides having higher resolution, these systems are cost-effective compared to S- or C-band radars because of smaller antenna size. Disadvantages of single X-band radars are the large influence of attenuation by liquid water and a relatively short range.

310

Properties of tropical convection observed by ARM millimeter-radars  

NLE Websites -- All DOE Office Websites (Extended Search)

Properties of tropical convection observed by ARM millimeter-radars Properties of tropical convection observed by ARM millimeter-radars Haynes, John Colorado State University Stephens, Graeme Colorado State University Category: Cloud Properties The results of an analysis of tropical cloud systems observed from a variety of vertically pointing radar systems are described. In particular, observations taken during five years of operation of the ARM millimeter wavelength radar system (MMCR) at Manus Island in the Tropical West Pacific region are characterized into cloud classes according to the radar reflectivity structures of these cloud systems, associated rainfall, and surface radiative properties. These observations of cloud properties are composited with respect to various phases of the Madden Julian Oscillation, which is a dominant mode of variability at Manus Island. A method of better

311

Title: Radar-observed convective characteristics during TWP-ICE  

NLE Websites -- All DOE Office Websites (Extended Search)

Title: Radar-observed convective characteristics during TWP-ICE Title: Radar-observed convective characteristics during TWP-ICE Schumacher, Courtney Texas A&M University Houze, Robert University of Washington May, Peter Bureau or Meteorology Research Centre Frederick, Kaycee Cetrone, Jasmine Vallgren, Andreas Category: Field Campaigns This poster will describe the radar dataset obtained in the Tropical Warm Pool International Cloud Experiment (TWP-ICE), which is to take place 20 January - 14 February 2006 in the vicinity of Darwin, Australia. We will describe the convective systems observed during the project by two scanning C-band Doppler radars, one of which will provide dual-polarization measurements, and ARM's vertically pointing cloud radar and lidar installations. In addition, we will discuss the potential for combining

312

Improved Smart Ground Multimeter  

Science Conference Proceedings (OSTI)

The Smart Ground Multimeter (SGM) underwent three major redesigns since its original development in the early 1980s. This report describes the latest redesign and provides useful tips on the assessment of measured data quality and on resolving measurement problems in the field.

2006-12-18T23:59:59.000Z

313

Substation grounding programs  

SciTech Connect

The five volume report comprises the user manual, installation, and validation manual and an applications guide for the SGA (Substation Grounding Analysis) software package. SGA consists of four computer programs: (1) SOMIP, (2) SMECC, (3) SGSYS, and (4) TGRND. The first three programs provide a comprehensive analysis tool for the design of substation grounding systems to meet safety standards. The fourth program, TGRND, provides a state of the art analysis tool for computing transient ground potential rise and ground system impedance. This part of the report, Volume 1, is a users manual and an installation and validation manual for the computer program SOMIP (SOil Measurement Interpretation Program). This program computes the best estimate of the parameters of a two layer soil model from usual soil resistivity measurements. Four pin or three pin soil measurements can be accommodated. In addition, it provides error bounds on the soil parameters for a given confidence level. The users manual describes data requirements and data preparation procedures. The installation and validation manual describes the computer files which make up the program SOMIP and provides two test cases for validation purposes. 4 refs.

Meliopoulos, A.P.S. (Georgia Inst. of Tech., Atlanta, GA (United States). School of Electrical Engineering)

1992-05-01T23:59:59.000Z

314

Studies of Precipitation Processes in the Troposphere Using an FM-CW Radar  

Science Conference Proceedings (OSTI)

In the field of FM-CW tropospheric radar, new breakthroughs have become possible due to progress in FM-CW radar hardware, in FM-CW radar signal processing and in the availability of the Doppler polarimetric FM-CW radar DARR. DARR has a high ...

L. P. Ligthart; L. R. Nieuwkerk

1989-10-01T23:59:59.000Z

315

Redshift of photons penetrating a hot plasma  

E-Print Network (OSTI)

A new interaction, plasma redshift, is derived, which is important only when photons penetrate a hot, sparse electron plasma. The derivation of plasma redshift is based entirely on conventional axioms of physics, without any new assumptions. The calculations are only more exact than those usually found in the literature. When photons penetrate a cold and dense electron plasma, they lose energy through ionization and excitation, through Compton scattering on the individual electrons, and through Raman scattering on the plasma frequency. But when the plasma is very hot and has low density, such as in the solar corona, the photons lose energy also in plasma redshift, which is an interaction with the electron plasma. The energy loss of a photon per electron in the plasma redshift is about equal to the product of the photon’s energy and one half of the Compton cross-section per electron. This energy loss (plasma redshift of the photons) consists of very small quanta, which are absorbed by the plasma and cause a significant heating. In quiescent solar corona, this heating starts in the transition zone to the solar corona and is a major fraction of the coronal heating. Plasma redshift contributes also to the heating of the interstellar plasma, the galactic corona, and the intergalactic plasma. Plasma redshift explains

Ari Brynjolfsson

2005-01-01T23:59:59.000Z

316

High Penetration Photovoltaic Case Study Report  

DOE Green Energy (OSTI)

Technical concerns with integrating higher penetrations of photovoltaic (PV) systems include grid stability, voltage regulation, power quality (voltage rise, sags, flicker, and frequency fluctuations), and protection and coordination. The current utility grid was designed to accommodate power flows from the central generation source to the transmission system and eventually to the distribution feeders. At the distribution level, the system was designed to carry power from the substation toward the load. Renewable distributed generation, particularly solar PV, provides power at the distribution level challenging this classical paradigm. As these resources become more commonplace the nature of the distribution network and its operation is changing to handle power flow in both directions. This report is focused on large PV installations in which penetration is significantly greater than 15% of maximum daytime feeder load. These case studies are intended to demonstrate success stories with integration of large PV plants at the distribution level as well as some of the solutions used by the utility to ensure safe, reliable operation of both the PV system and the distribution network.

Bank, J.; Mather, B.; Keller, J.; Coddington, M.

2013-01-01T23:59:59.000Z

317

Synthetic aperture radar processing with tiered subapertures  

SciTech Connect

Synthetic Aperture Radar (SAR) is used to form images that are maps of radar reflectivity of some scene of interest, from range soundings taken over some spatial aperture. Additionally, the range soundings are typically synthesized from a sampled frequency aperture. Efficient processing of the collected data necessitates using efficient digital signal processing techniques such as vector multiplies and fast implementations of the Discrete Fourier Transform. Inherent in image formation algorithms that use these is a trade-off between the size of the scene that can be acceptably imaged, and the resolution with which the image can be made. These limits arise from migration errors and spatially variant phase errors, and different algorithms mitigate these to varying degrees. Two fairly successful algorithms for airborne SARs are Polar Format processing, and Overlapped Subaperture (OSA) processing. This report introduces and summarizes the analysis of generalized Tiered Subaperture (TSA) techniques that are a superset of both Polar Format processing and OSA processing. It is shown how tiers of subapertures in both azimuth and range can effectively mitigate both migration errors and spatially variant phase errors to allow virtually arbitrary scene sizes, even in a dynamic motion environment.

Doerry, A.W. [Sandia National Labs., Albuquerque, NM (United States). Synthetic Aperture Radar Dept.

1994-06-01T23:59:59.000Z

318

Assembly flow simulation of a radar  

Science Conference Proceedings (OSTI)

A discrete event simulation model has been developed to predict the assembly flow time of a new radar product. The simulation was the key tool employed to identify flow constraints. The radar, production facility, and equipment complement were designed, arranged, and selected to provide the most manufacturable assembly possible. A goal was to reduce the assembly and testing cycle time from twenty-six weeks to six weeks. A computer software simulation package (SLAM II) was utilized as the foundation a for simulating the assembly flow time. FORTRAN subroutines were incorporated into the software to deal with unique flow circumstances that were not accommodated by the software. Detailed information relating to the assembly operations was provided by a team selected from the engineering, manufacturing management, inspection, and production assembly staff. The simulation verified that it would be possible to achieve the cycle time goal of six weeks. Equipment and manpower constraints were identified during the simulation process and adjusted as required to achieve the flow with a given monthly production requirement. The simulation is being maintained as a planning tool to be used to identify constraints in the event that monthly output is increased. ``What-if`` studies have been conducted to identify the cost of reducing constraints caused by increases in output requirement.

Rutherford, W.C.; Biggs, P.M.

1993-10-01T23:59:59.000Z

319

Magneto-radar detector and method - Energy Innovation Portal  

Geothermal; Hydrogen and Fuel Cell; Hydropower, Wave and Tidal; ... is capable of being employed to provide superior materials penetration while ...

320

Ground State Entanglement Energetics  

E-Print Network (OSTI)

We consider the ground state of simple quantum systems coupled to an environment. In general the system is entangled with its environment. As a consequence, even at zero temperature, the energy of the system is not sharp: a projective measurement can find the system in an excited state. We show that energy fluctuation measurements at zero temperature provide entanglement information. For two-state systems which exhibit a persistent current in the ground state, energy fluctuations and persistent current fluctuations are closely related. The harmonic oscillator serves to illustrate energy fluctuations in a system with an infinite number of states. In addition to the energy distribution we discuss the energy-energy time-correlation function in the zero-temperature limit.

M. Buttiker; A. N. Jordan

2005-01-04T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

CEUS Ground Motion Project  

Science Conference Proceedings (OSTI)

Three utilities are currently pursuing early site permits (ESPs) for possible siting of new nuclear power plant facilities in the central and eastern United States (CEUS). The geological, seismological, and engineering characteristics of a site and its environs must be investigated in sufficient scope and detail. These investigations are needed to adequately evaluate a proposed site and to provide sufficient information for estimating the site's safe shutdown earthquake (SSE) ground motion. Nuclear Regul...

2003-12-02T23:59:59.000Z

322

Characterization of nuclear reactor containment penetrations. Preliminary report  

Science Conference Proceedings (OSTI)

This report summarizes the survey work conducted by Argonne National Laboratory on the design and details of major penetrations in 22 nuclear power plants. The survey includes all containment types and materials in current use. It also includes details of all types of penetrations (except for electrical penetration assemblies and valves) and the seals and gaskets used in them. The report provides a test matrix for testing major penetrations and for testing seals and gaskets in order to evaluate their leakage potential under severe accident conditions.

Bump, T.R.; Seidensticker, R.W.; Shackelford, M.A.; Gambhir, V.K.; McLennan, G.L.

1984-06-01T23:59:59.000Z

323

Penetrating Insights: NIST Airframe Tests Help Ensure Better ...  

Science Conference Proceedings (OSTI)

Penetrating Insights: NIST Airframe Tests Help Ensure Better Shielding for Flight ... were a Boeing 737-200 and a Bombardier Global 5000 business ...

2010-12-29T23:59:59.000Z

324

Multi-Well Sample Plate Cover Penetration System for Automated ...  

Current Weather. Protocol Office. Where to stay. Tri ... LLNL's multi-well plate cover penetration system is an array cutting and tape folding tool, based on 96-well ...

325

Forecasting new product penetration with flexible substitution patterns  

E-Print Network (OSTI)

choice model for forecasting demand for alternative-fuel7511, Urban Travel Demand Forecasting Project, Institute of89 (1999) 109—129 Forecasting new product penetration with ?

Brownstone, David; Train, Kenneth

1999-01-01T23:59:59.000Z

326

Forecasting new product penetration with flexible substitution patterns  

E-Print Network (OSTI)

7511, Urban Travel Demand Forecasting Project, Institute ofchoice model for forecasting demand for alternative-fuel89 (1999) 109—129 Forecasting new product penetration with

Brownstone, David; Train, Kenneth

1999-01-01T23:59:59.000Z

327

Ground Squirrels and Gophers  

NLE Websites -- All DOE Office Websites (Extended Search)

Squirrels and Gophers Squirrels and Gophers Nature Bulletin No. 224-A April 2, 1966 Forest Preserve District of Cook County Seymour Simon, President Roland F. Eisenbeis, Supt. of Conservation GROUND SQUIRRELS AND GOPHERS On sunny summer days, a dusty-colored animal with yellowish and brown stripes, about the size of a small rat, often may be noticed creeping through the grass of prairies, pastures, golf courses or lawns. Watch him. He pauses every few feet to sit up, look and listen for a moment. Nervous and timid, he crouches low at every distant sound or passing shadow. Startle him and he scurries away, and then may suddenly halt and freeze, bolt upright, as stiff and straight as a stake driven in the ground. If approached, he gives a loud shrill trilling whistle and, with a flip of his tail, pops out of sight. Watch that spot closely and, in less than a minute, a snaky head appears. Be quiet. He has many enemies above ground and he also has a lot of curiosity. Presently he sits up upon his haunches again.

328

Redshift of photons penetrating a hot plasma  

E-Print Network (OSTI)

A new interaction, plasma redshift, is derived, which is important only when photons penetrate a hot, sparse electron plasma. The derivation of plasma redshift is based entirely on conventional axioms of physics. When photons penetrate a cold and dense plasma, they lose energy through ionization and excitation, Compton scattering on the individual electrons, and Raman scattering on the plasma frequency. But in sparse hot plasma, such as in the solar corona, the photons lose energy also in plasma redshift. The energy loss per electron in the plasma redshift is about equal to the product of the photon's energy and one half of the Compton cross-section per electron. In quiescent solar corona, this heating starts in the transition zone to the corona and is a major fraction of the coronal heating. Plasma redshift contributes also to the heating of the interstellar plasma, the galactic corona, and the intergalactic plasma. Plasma redshift explains the solar redshifts, the redshifts of the galactic corona, the cosmological redshifts, the cosmic microwave background, and the X-ray background. The plasma redshift explains the observed magnitude-redshift relation for supernovae SNe Ia without the big bang, dark matter, or dark energy. There is no cosmic time dilation. The universe is not expanding. The plasma redshift, when compared with experiments, shows that the photons' classical gravitational redshifts are reversed as the photons move from the Sun to the Earth. This is a quantum mechanical effect. As seen from the Earth, a repulsion force acts on the photons. This means that there is no need for Einstein's Lambda term. The universe is quasi-static, infinite, and everlasting.

Ari Brynjolfsson

2004-01-21T23:59:59.000Z

329

History of Operational Use of Weather Radar by U.S. Weather Services. Part II: Development of Operational Doppler Weather Radars  

Science Conference Proceedings (OSTI)

The second part of a history of the use of storm surveillance radars by operational military and civil weather services in the United States is presented. This part describes the genesis and evolution of two operational Doppler weather radars, ...

Roger C. Whiton; Paul L. Smith; Stuart G. Bigler; Kenneth E. Wilk; Albert C. Harbuck

1998-06-01T23:59:59.000Z

330

Comparison of Radar Reflectivity and Vertical Velocity Observed with a Scannable C-Band Radar and Two UHF Profilers in the Lower Troposphere  

Science Conference Proceedings (OSTI)

A C-band meteorological Doppler radar has been used to investigate the dynamic processes and the coherent organizations within a clear air atmospheric boundary layer (ABL). Depending on the atmospheric conditions, this moderate sensitive radar ...

M. Lothon; B. Campistron; S. Jacoby-Koaly; B. Bénech; F. Lohou; F. Girard-Ardhuin

2002-06-01T23:59:59.000Z

331

Radar, satellite, and lightning characteristics of select mesoscale convective systems in Texas  

E-Print Network (OSTI)

This study compares radar data from the League City, Texas WSR-88D and cloud-to-ground (CG) lightning data for a set of eight mesoscale convective systems (MCSs) which occur at various stages of development along the upper Texas Gulf Coast. Vertical profiles of radar reflectivity (VPRR) as well as plan views and vertical cross sections are constructed to characterize the structure and relative strength of each MCS. The VPRR are also compared with similar profiles from tropical oceanic MCSs. The data show that in all cases the majority of negative CG lightning flashes are located near high reflectivity convective cores (> 35 dBZ) in the mixed phase region (O'C -20'C). Growing or mature MCSs typically had larger negative flash counts and higher percentages of negative lightning (> 80%) associated with convective cores than MCSs at later stages of their life cycle. Comparison of the median VPRR for the various MCSs showed that although each case had high reflectivity cores (45-55 dBZ) in the lowest 2 to 3 km, the more electrically active MCSs were characterized by smaller reflectivity lapse rates (decrease of reflectivity with height) in mixed phase region than the cores in the remaining systems. Based on existing theories of charge separation, the observation of high negative flash counts coincident with convective cores having small reflectivity lapse rates in the mixed phase region is consistent with the presence of large ice particles aloft. Positive CG flashes were mostly located in low reflectivity (< 30 dBZ near the-10C level) stratiform regions, independent of MCS life cycle stage or VPRR type. Several cases with reports of large hail also had high positive flash densities associated with high reflectivity cores. Devlin et al. (1995) compare 85 GHz brightness temperatures from the Special Sensor Microwave/Imager to lightning data for the same set of MCSs examined in this study. The results using radar and 85 GHz data indicate that the presence of large ice particles aloft is the common linkage between MCSs with lightning, with high radar reflectivity aloft, and large 85 GHz temperature depressions.

Toracinta, Ernest Richard

1995-01-01T23:59:59.000Z

332

Applications of Radar Interferometry to Detect Surface Deformation in  

Open Energy Info (EERE)

Applications of Radar Interferometry to Detect Surface Deformation in Applications of Radar Interferometry to Detect Surface Deformation in Geothermal Areas of Imperial Valley in Southern California Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Applications of Radar Interferometry to Detect Surface Deformation in Geothermal Areas of Imperial Valley in Southern California Abstract InSAR (interferometric synthetic aperture radar) is applied in Imperial Valley of southern California to detect and characterize surface deformation in existing geothermal fields, possible future geothermal developments, and around faults. The data used are from the Envisat satellite, collected over the period 2003-2010. The specific InSAR technique applied, SqueeSARTM, identifies permanent and distributed scatterers (PS and DS), which play the role of numerous benchmarks

333

The “Owl Horn” Radar Signature in Developing Southern Plains Supercells  

Science Conference Proceedings (OSTI)

During spring 2001 in the Southern Plains, a recurring, hitherto undocumented reflectivity signature that the authors have called the “Owl Horn” signature (because the radar reflectivity pattern resembles the profile of the Great Horned Owl) was ...

Matthew R. Kramar; Howard B. Bluestein; Andrew L. Pazmany; John D. Tuttle

2005-09-01T23:59:59.000Z

334

Radar Observations and Simulation of the Melting Layer of Precipitation  

Science Conference Proceedings (OSTI)

The melting layer in precipitation is physically modeled and compared with high resolution Doppler radar data. The model includes a new formulation of the dielectric properties and can handle all ice particles with densities ranging from pure ...

Wim Klaassen

1988-12-01T23:59:59.000Z

335

Mesocyclone and Microburst Signature Distortion with Dual PRT Radars  

Science Conference Proceedings (OSTI)

A simple model is used to illustrate the limitations of dual pulse repetition time (PRT) radars for measurements of wind fields with strong horizontal wind gradients. In such conditions, errors may occur even if the radial velocity measurements ...

Peter T. May

2001-07-01T23:59:59.000Z

336

An Interactive System for Compositing Digital Radar and Satellite Data  

Science Conference Proceedings (OSTI)

This paper describes an approach for compositing digital radar data and GOES satellite data for meteorological analysis. The processing is performed on a user-oriented image processing system, and is designed to be used in the research mode. It ...

Gerald M. Heymsfield; Koushik K. Ghosh; Lily C. Chen

1983-05-01T23:59:59.000Z

337

Modeling Of Surface Deformation From Satellite Radar Interferometry In The  

Open Energy Info (EERE)

Modeling Of Surface Deformation From Satellite Radar Interferometry In The Modeling Of Surface Deformation From Satellite Radar Interferometry In The Salton Sea Geothermal Field, California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Modeling Of Surface Deformation From Satellite Radar Interferometry In The Salton Sea Geothermal Field, California Details Activities (1) Areas (1) Regions (0) Abstract: Surface deformation in the Salton Sea geothermal field is modeled using results from satellite radar interferometry, data from leveling surveys, and observations from the regional GPS network. The field is located in the Salton Trough, an active spreading center in southern California, which is traversed by the Brawley seismic zone. Deformation time series at thousands of points in the study area are obtained from a

338

Sensitivity Studies of the Models of Radar-Rainfall Uncertainties  

Science Conference Proceedings (OSTI)

It is well acknowledged that there are large uncertainties associated with the operational quantitative precipitation estimates produced by the U.S. national network of the Weather Surveillance Radar-1988 Doppler (WSR-88D). These errors result ...

Gabriele Villarini; Witold F. Krajewski

2010-02-01T23:59:59.000Z

339

Stratocumulus Liquid Water Content from Dual-Wavelength Radar  

Science Conference Proceedings (OSTI)

A technique is described to retrieve stratocumulus liquid water content (LWC) using the differential attenuation measured by vertically pointing radars at 35 and 94 GHz. Millimeter-wave attenuation is proportional to LWC and increases with ...

Robin J. Hogan; Nicolas Gaussiat; Anthony J. Illingworth

2005-08-01T23:59:59.000Z

340

On Deriving Vertical Air Motions from Cloud Radar Doppler Spectra  

Science Conference Proceedings (OSTI)

A method for deriving vertical air motions from cloud radar Doppler spectrum measurements is introduced. The method is applicable to cloud volumes containing small particles, in this case liquid droplets, which are assumed to trace vertical air ...

Matthew D. Shupe; Pavlos Kollias; Michael Poellot; Edwin Eloranta

2008-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Two Examples of Operational Tornado Warnings Using Doppler Radar Data  

Science Conference Proceedings (OSTI)

The National Weather Service Forecast Office in Denver, Colorado; has access to a variety of new observational datasets via an advanced, interactive workstation. This paper describes the impact of one of these datasets—Doppler radar—on the real-...

Lawrence B. Dunn

1990-02-01T23:59:59.000Z

342

Using Radar Wind Observations to Improve Mesoscale Numerical Weather Prediction  

Science Conference Proceedings (OSTI)

A high-resolution radar data assimilation system is presented for high-resolution numerical weather prediction models. The system is under development at the Naval Research Laboratory for the Navy’s Coupled Ocean–Atmosphere Mesoscale Prediction ...

Qingyun Zhao; John Cook; Qin Xu; Paul R. Harasti

2006-08-01T23:59:59.000Z

343

Advanced Weather Radar Systems in Europe: The COST 75 Action  

Science Conference Proceedings (OSTI)

The European Union COST (Cooperation in Science and Technology) action on advanced weather radar systems is described. The associated five-year research project, which began in early 1993, has the objective to develop guideline specifications for ...

P. Meischner; C. Collier; A. Illingworth; J. Joss; W. Randeu

1997-07-01T23:59:59.000Z

344

Use of Dual-Wavelength Radar for Snow Parameter Estimates  

Science Conference Proceedings (OSTI)

Use of dual-wavelength radar, with properly chosen wavelengths, will significantly lessen the ambiguities in the retrieval of microphysical properties of hydrometeors. In this paper, a dual-wavelength algorithm is described to estimate the ...

Liang Liao; Robert Meneghini; Toshio Iguchi; Andrew Detwiler

2005-10-01T23:59:59.000Z

345

Radar Reflectivity–Based Estimates of Mixed Layer Depth  

Science Conference Proceedings (OSTI)

This study investigates the potential for estimating mixed layer depth by taking advantage of the radial gradients in the radar reflectivity field produced by the large vertical gradients in water vapor mixing ratio that are characteristic of the ...

P. L. Heinselman; P. L. Spencer; K. L. Elmore; D. J. Stensrud; R. M. Hluchan; P. C. Burke

2009-02-01T23:59:59.000Z

346

An Evaluation of Radar Rainfall Estimates from Specific Differential Phase  

Science Conference Proceedings (OSTI)

Specific differential propagation phase (KDP) is examined for estimating convective rainfall in Colorado and Kansas. Estimates are made at S band with KDP alone and in combination with radar reflectivity (ZH). Results are compared to gauge ...

Edward A. Brandes; Alexander V. Ryzhkov; Dus?an S. Zrni?

2001-03-01T23:59:59.000Z

347

Radar Signatures of Tropical Cyclone Tornadoes in Central North Carolina  

Science Conference Proceedings (OSTI)

During the tropical cyclone season of 2004, there were four tropical cyclones that spawned tornadoes in central North Carolina: Frances, Gaston, Ivan, and Jeanne. This study examines the environmental characteristics and radar signatures from ...

Douglas Schneider; Scott Sharp

2007-04-01T23:59:59.000Z

348

Radar Wind Profiler Radial Velocity: A Comparison with Doppler Lidar  

Science Conference Proceedings (OSTI)

The accuracy of the radial wind velocity measured with a radar wind profiler will depend on turbulent variability and instrumental noise. Radial velocity estimates of a boundary layer wind profiler are compared with those estimated by a Doppler ...

Stephen A. Cohn; R. Kent Goodrich

2002-12-01T23:59:59.000Z

349

Assessment of Vertically Integrated Liquid (VIL) Water Content Radar Measurement  

Science Conference Proceedings (OSTI)

Vertically integrated liquid (VIL) water content is a parameter obtained from a radar performing voluminal scanning. This parameter has proven useful in the detection of severe storms and may be a worthwhile indicator for very short-term rainfall ...

Brice Boudevillain; Hervé Andrieu

2003-06-01T23:59:59.000Z

350

Raindrop Size Distributions and the Radar Bright Band  

Science Conference Proceedings (OSTI)

The relationship between raindrop size distribution, measured with a disdrometer, and a radar parameter of the melting-layer bright band is investigated. The data, obtained in July 1993 in Switzerland, cover 120 h of precipitation. A good ...

A. Huggel; W. Schmid; A. Waldvogel

1996-10-01T23:59:59.000Z

351

The Assimilation of Radar Data for Weather Prediction  

Science Conference Proceedings (OSTI)

Assimilation of radar data is one of the key scientific challenges for numerical weather prediction of convective systems. Considerable progress has been made in recent years including retrieval of boundary layer winds from single-Doppler ...

Juanzhen Sun; James W. Wilson

2003-08-01T23:59:59.000Z

352

TRMM Radar Observations of Shallow Precipitation over the Tropical Oceans  

Science Conference Proceedings (OSTI)

Observations from the precipitation radar aboard the Tropical Rainfall Measuring Mission satellite provide the first opportunity to map vertical structure properties of rain over the entire Tropics and subtropics. Storm height histograms reveal a ...

David A. Short; Kenji Nakamura

2000-12-01T23:59:59.000Z

353

A Microphysical Interpretation of Radar Reflectivity–Rain Rate Relationships  

Science Conference Proceedings (OSTI)

The microphysical aspects of the relationship between radar reflectivity Z and rainfall rate R are examined. Various concepts discussed in the literature are integrated into a coherent analytical framework and discussed with a focus on the ...

Matthias Steiner; James A. Smith; Remko Uijlenhoet

2004-05-01T23:59:59.000Z

354

A Rain-Rate Retrieval Algorithm for Attenuated Radar Measurements  

Science Conference Proceedings (OSTI)

A dynamic regularization scheme for rain-rate retrievals from attenuated radar measurements is presented. Most regularization techniques, including the optimal estimation method, use the state-space parameters to regularize the problem, which ...

Prabhat K. Koner; Alessandro Battaglia; Clemens Simmer

2010-03-01T23:59:59.000Z

355

The Spaced Antenna Technique for Radar Wind Profiling  

Science Conference Proceedings (OSTI)

The Doppler method for radar wind profiling of the troposphere and stratosphere has been the standard technique used for operational and most research applications of the instrumentation. An alternative approach for measuring winds, by making use ...

M. F. Larsen; J. Röttger

1989-12-01T23:59:59.000Z

356

Quality Control and Verification of Weather Radar Wind Profiles  

Science Conference Proceedings (OSTI)

Weather radar wind profiles (WRWPs) have been retrieved from Doppler volume scans using different implementations of the velocity–azimuth display (VAD) and volume velocity processing (VVP) methods. An extensive quality control of the radial ...

Iwan Holleman

2005-10-01T23:59:59.000Z

357

Cloud Model-Based Simulation of Spaceborne Radar Observations  

Science Conference Proceedings (OSTI)

Simulations of observations from potential spaceborne radars are made based on storm structure generated from the three-dimensional (3D) Goddard cumulus ensemble model simulation of an intense overland convective system. Five frequencies of 3, 10,...

H-Y. M. Yeh; N. Prasad; R. Meneghini; W-K. Tao; J. A. Jones; R. F. Adler

1995-01-01T23:59:59.000Z

358

Radar Observations of the Early Evolution of Bow Echoes  

Science Conference Proceedings (OSTI)

The evolution of 273 bow echoes that occurred over the United States from 1996 to 2002 was examined, especially with regard to the radar reflectivity characteristics during the prebowing stage. It was found that bow echoes develop from the ...

Brian A. Klimowski; Mark R. Hjelmfelt; Matthew J. Bunkers

2004-08-01T23:59:59.000Z

359

The CASA Integrated Project 1 Networked Radar System  

Science Conference Proceedings (OSTI)

This paper describes the Collaborative Adaptive Sensing of the Atmosphere (CASA) Integrated Project 1 (IP1) weather radar network, the first distributed collaborative adaptive sensing test bed of the Engineering Research Center for Collaborative ...

Francesc Junyent; V. Chandrasekar; D. McLaughlin; E. Insanic; N. Bharadwaj

2010-01-01T23:59:59.000Z

360

Prospects of the WSR-88D Radar for Cloud Studies  

Science Conference Proceedings (OSTI)

Sounding of nonprecipitating clouds with the 10-cm wavelength Weather Surveillance Radar-1988 Doppler (WSR-88D) is discussed. Readily available enhancements to signal processing and volume coverage patterns of the WSR-88D allow observations of a ...

Valery M. Melnikov; Dusan S. Zrni?; Richard J. Doviak; Phillip B. Chilson; David B. Mechem; Yefim L. Kogan

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Assessing Snowfall Rates from X-Band Radar Reflectivity Measurements  

Science Conference Proceedings (OSTI)

Realistic aggregate snowflake models and experimental snowflake size distribution parameters are used to derive X-band power-law relations between the equivalent radar reflectivity factor Ze and the liquid equivalent snowfall precipitation rate S ...

Sergey Y. Matrosov; Carroll Campbell; David Kingsmill; Ellen Sukovich

2009-11-01T23:59:59.000Z

362

Spatial Averaging of HF Radar Data for Wave Measurement Applications  

Science Conference Proceedings (OSTI)

HF radar data are often collected for time periods that are optimised for current measurement applications where, in many cases, very high temporal resolution is needed. Previous work has demonstrated that this does not provide sufficient ...

Lucy R. Wyatt; Jasmine B. D. Jaffrés; Mal L. Heron

363

Observations of Strong Surface Radar Ducts over the Persian Gulf  

Science Conference Proceedings (OSTI)

Ducting of microwave radiation is a common phenomenon over the oceans. The height and strength of the duct are controlling factors for radar propagation and must be determined accurately to assess propagation ranges. A surface evaporation duct ...

Ian M. Brooks; Andreas K. Goroch; David P. Rogers

1999-09-01T23:59:59.000Z

364

Measurement of Raindrop Size Distributions Using a Small Doppler Radar  

Science Conference Proceedings (OSTI)

A small X-band bistatic Doppler radar originally developed for use in automated weather stations as a Precipitation Occurrence Sensor System (POSS) can also measure real time raindrop size distributions. In contrast to large-scale pulsed Doppler ...

Brian E. Sheppard

1990-04-01T23:59:59.000Z

365

A Radar and Electrical Study of Tropical “Hot Towers”  

Science Conference Proceedings (OSTI)

Radar and electrical measurements for deep tropical convection are examined for both “break period” and “monsoonal” regimes in the vicinity of Darwin, Australia. Break period convection consists primarily of deep continental convection, whereas ...

E. R. Williams; S. G. Geotis; N. Renno; S. A. Rutledge; E. Rasmussen; T. Rickenbach

1992-08-01T23:59:59.000Z

366

Earth curvature and atmospheric refraction effects on radar signal propagation.  

SciTech Connect

The earth isn't flat, and radar beams don't travel straight. This becomes more noticeable as range increases, particularly at shallow depression/grazing angles. This report explores models for characterizing this behavior.

Doerry, Armin Walter

2013-01-01T23:59:59.000Z

367

A Proposed Technique for Diagnosis by Radar of Hurricane Structure  

Science Conference Proceedings (OSTI)

A Doppler radar technique is proposed for remote estimation of hurricane structure by sampling the kinematic properties of the hurricane wind field in a relatively small circular area outside the radius of maximum winds. This technique uses ...

Ralph J. Donaldson Jr.

1991-12-01T23:59:59.000Z

368

A Radar Simulator for High-Resolution Nonhydrostatic Models  

Science Conference Proceedings (OSTI)

A full radar simulator for high-resolution (1–5 km) nonhydrostatic models has been developed within the research nonhydrostatic mesoscale atmospheric (Meso-NH) model. This simulator is made up of building blocks, each of which describes a ...

Olivier Caumont; Véronique Ducrocq; Guy Delrieu; Marielle Gosset; Jean-Pierre Pinty; Jacques Parent du Châtelet; Hervé Andrieu; Yvon Lemaître; Georges Scialom

2006-08-01T23:59:59.000Z

369

Statistical Quality of Spectral Polarimetric Variables for Weather Radar  

Science Conference Proceedings (OSTI)

Spectral polarimetry for weather radar capitalizes on both Doppler and polarimetric measurements to reveal polarimetric variables as a function of radial velocity through spectral analysis. For example, spectral differential reflectivity at a ...

Tian-You Yu; Xiao Xiao; Yadong Wang

2012-09-01T23:59:59.000Z

370

The Atmospheric Radiation Measurement Program Cloud Radars: Operational Modes  

Science Conference Proceedings (OSTI)

During the past decade, the U.S. Department of Energy (DOE), through the Atmospheric Radiation Measurement (ARM) Program, has supported the development of several millimeter-wavelength radars for the study of clouds. This effort has culminated in ...

Eugene E. Clothiaux; Kenneth P. Moran; Brooks E. Martner; Thomas P. Ackerman; Gerald G. Mace; Taneil Uttal; James H. Mather; Kevin B. Widener; Mark A. Miller; Daniel J. Rodriguez

1999-07-01T23:59:59.000Z

371

A Butterfly Algorithm for Synthetic Aperture Radar Imaging  

E-Print Network (OSTI)

In spite of an extensive literature on fast algorithms for synthetic aperture radar (SAR) imaging, it is not currently known if it is possible to accurately form an image from N data points in provable near-linear time ...

Demanet, Laurent

372

Radar and Profiler Analysis of Colliding Boundaries: A Case Study  

Science Conference Proceedings (OSTI)

The kinematics of a head-on collision between two gust fronts, followed by a secondary collision between a third gust front and a bore generated by the initial collision, are described using analyses of Weather Surveillance Radar-1988 Doppler (...

Haldun Karan; Kevin Knupp

2009-07-01T23:59:59.000Z

373

Cloud Liquid Water and Ice Content Retrieval by Multiwavelength Radar  

Science Conference Proceedings (OSTI)

Cloud liquid water and ice content retrieval in precipitating clouds by the differential attenuation method using a dual-wavelength radar, as a function of the wavelength pair, is first discussed. In the presence of non-Rayleigh scatterers, ...

Nicolas Gaussiat; Henri Sauvageot; Anthony J. Illingworth

2003-09-01T23:59:59.000Z

374

Polarimetric Radar at Attenuated Wavelength as a Hydrological Sensor  

Science Conference Proceedings (OSTI)

A new method for the estimation of the rain rate using a polarimetric radar at attenuated wavelengths is proposed. At attenuated wavelengths, the differential reflectivity for horizontal and vertical polarization, ZDR, is the addition of a term ...

Henri Sauvageot

1996-06-01T23:59:59.000Z

375

The Clear-Air Coastal Vespertine Radar Bands  

Science Conference Proceedings (OSTI)

It is known that the insects observed in the lower layers of the atmosphere produce radar echos and that their spatiotemporal distribution is strongly influenced by the meteorological conditions and the thermodynamic structure of the atmosphere. ...

Henri Sauvageot; Gilbert Despaux

1996-04-01T23:59:59.000Z

376

The Effects of Rain on ERS-1 Radar Altimeter Data  

Science Conference Proceedings (OSTI)

An investigation into a potentially important, but little-studied effect on altimeter data—rain contamination—has been carried out using ERS-1. The method involves identifying large changes in the radar backscatter coefficient and relating these ...

Trevor H. Guymer; Graham D. Quartly; Meric A. Srokosz

1995-12-01T23:59:59.000Z

377

Ocean Wave Slope Observations Using Radar Backscatter and Laser Altimeters  

Science Conference Proceedings (OSTI)

Combination of laser and radar aboard an aircraft is used to directly measure long gravity wave surface tilting simultaneously with nadir-viewing microwave backscatter from the sea surface. The presented dataset is extensive, encompassing varied ...

D. Vandemark; B. Chapron; J. Sun; G. H. Crescenti; H. C. Graber

2004-12-01T23:59:59.000Z

378

Impacts of Polarimetric Radar Observations on Hydrologic Simulation  

Science Conference Proceedings (OSTI)

Rainfall estimated from the polarimetric prototype of the Weather Surveillance Radar-1988 Doppler [WSR-88D (KOUN)] was evaluated using a dense Micronet rain gauge network for nine events on the Ft. Cobb research watershed in Oklahoma. The ...

Jonathan J. Gourley; Scott E. Giangrande; Yang Hong; Zachary L. Flamig; Terry Schuur; Jasper A. Vrugt

2010-06-01T23:59:59.000Z

379

CloudSat as a Global Radar Calibrator  

Science Conference Proceedings (OSTI)

The calibration of the CloudSat spaceborne cloud radar has been thoroughly assessed using very accurate internal link budgets before launch, comparisons with predicted ocean surface backscatter at 94 GHz, direct comparisons with airborne cloud ...

A. Protat; D. Bouniol; E. J. O’Connor; H. Klein Baltink; J. Verlinde; K. Widener

2011-03-01T23:59:59.000Z

380

Upscale Evolution of MCSs: Doppler Radar Analysis and Analytical Investigation  

Science Conference Proceedings (OSTI)

The development of two small mesoscale convective systems (MCSs) in northeastern Colorado is investigated via dual-Doppler radar analysis. The first system developed from several initially isolated cumulonimbi, which gradually coalesced into a ...

Ray L. McAnelly; Jason E. Nachamkin; William R. Cotton; Melville E. Nicholls

1997-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Remote Sensing of Hail with a Dual Linear Polarization Radar  

Science Conference Proceedings (OSTI)

A technique for the remote sensing of hail with an S-band dual linear polarization radar is described. The method employs a new hail signal HDR, which is derived from disdrometer measurements of raindrop size distributions. Experimental ...

K. Aydin; T. A. Seliga; V. Balaji

1986-10-01T23:59:59.000Z

382

VHF Doppler Radar Observations of Buoyancy Waves Associated with Thunderstorms  

Science Conference Proceedings (OSTI)

The Platteville VHF Doppler radar, located on the Colorado piedmont near Platteville, Colorado, continuously measured the vertical wind velocity during a 12-day period in late July and early August 1981. Measurements were made every 2.5 min on ...

Daren Lu; T. E. VanZandt; W. L. Clark

1984-01-01T23:59:59.000Z

383

Operational Weather Radar in the United States: Progress and Opportunity  

Science Conference Proceedings (OSTI)

The NEXRAD operational system consisting of a network of WSR—88D radars is now operational within the 50 states, as well as Puerto Rico and Guam. This technology has been enthusiastically received by weather forecasters in all regions and ...

Robert J. Serafin; James W. Wilson

2000-03-01T23:59:59.000Z

384

Automatic Detection of Wind Turbine Clutter for Weather Radars  

Science Conference Proceedings (OSTI)

Wind turbines cause contamination of weather radar signals that is often detrimental and difficult to distinguish from cloud returns. Because the turbines are always at the same location, it would seem simple to identify where wind turbine ...

Kenta Hood; Sebastián Torres; Robert Palmer

2010-11-01T23:59:59.000Z

385

Antenna Pattern Analysis and Measurements for Multiparameter Radars  

Science Conference Proceedings (OSTI)

Measuring the full polarization matrix using a research radar requires knowledge of the complex (i.e., amplitude and phase) antenna pattern to properly correct for bias errors in the measurements. However, generally only power patterns are ...

V. Chandrasekar; R. Jeffrey Keeler

1993-10-01T23:59:59.000Z

386

Direct Observations of Coherent Backscatter of Radar Waves in Precipitation  

Science Conference Proceedings (OSTI)

In previous work, it was argued that a source of radar coherent scatter occurs in the direction perpendicular to the direction of wave propagation because of the presence of grids of enhanced particle concentrations with spatial periodicities in ...

A. R. Jameson; A. B. Kostinski

2010-09-01T23:59:59.000Z

387

Dealiasing of Doppler Radar Velocities Using a Torus Mapping  

Science Conference Proceedings (OSTI)

A novel dealiasing algorithm for Doppler radar velocity data has been developed at the Swedish Meteorological and Hydrological Institute (SMHI). Unlike most other methods, it does not need independent wind information from other instruments (e.g.,...

Günther Haase; Tomas Landelius

2004-10-01T23:59:59.000Z

388

An Automated Radar Technique for the Identification of Tropical Precipitation  

Science Conference Proceedings (OSTI)

A radar-based automated technique for the identification of tropical precipitation was developed to improve quantitative precipitation estimation during extreme rainfall events. The technique uses vertical profiles of reflectivity to identify the ...

Xiaoyong Xu; Kenneth Howard; Jian Zhang

2008-10-01T23:59:59.000Z

389

Finescale Radar Observations of Tornado and Mesocyclone Structures  

Science Conference Proceedings (OSTI)

A variety of vortex configurations observed at finescale with Doppler On Wheels (DOW) radars in and near the hook echoes of supercell thunderstorms are described. These include marginal/weak tornadoes, often with no documented condensation funnels,...

Joshua Wurman; Karen Kosiba

2013-10-01T23:59:59.000Z

390

Operational Monitoring of Weather Radar Receiving Chain Using the Sun  

Science Conference Proceedings (OSTI)

A method for operational monitoring of a weather radar receiving chain, including the antenna gain and the receiver, is presented. The “online” method is entirely based on the analysis of sun signals in the polar volume data produced during ...

Iwan Holleman; Asko Huuskonen; Mikko Kurri; Hans Beekhuis

2010-01-01T23:59:59.000Z

391

Measurement of Mean Raindrop Shape from Polarimetric Radar Observations  

Science Conference Proceedings (OSTI)

Interpretation of polarimetric radar measurements in rainfall such as differential reflectivity and specific differential phase shifts depends on the mean raindrop shape–size relationship. Currently, semiempirical relations between the oblateness ...

Eugenio Gorgucci; Gianfranco Scarchilli; V. Chandrasekar; V. N. Bringi

2000-10-01T23:59:59.000Z

392

Comparison of Polarimetric Radar Drop Size Distribution Retrieval Algorithms  

Science Conference Proceedings (OSTI)

Recently, two physically based algorithms, the “beta” (?) method and the “constrained-gamma” method, have been proposed for retrieving the governing parameters of the gamma drop size distribution (DSD) from polarimetric radar measurements. The ? ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2004-04-01T23:59:59.000Z

393

Polarization Radar Estimates of Raindrop Size Spectra and Rainfall Rates  

Science Conference Proceedings (OSTI)

The differential reflectivity (ZDR) measures the mean shape of hydrometeors and provides an estimate of the mean size of raindrops Observations of ZDR for rain may be combined with the conventional radar reflectivity factor (Z) and fitted to any ...

A. J. Illingworth; I. J. Caylor

1989-12-01T23:59:59.000Z

394

Partially Coherent Backscatter in Radar Observations of Precipitation  

Science Conference Proceedings (OSTI)

Classical radar theory only considers incoherent backscatter from precipitation. Can precipitation generate coherent scatter as well? Until now, the accepted answer has been no, because hydrometeors are distributed sparsely in space (relative to ...

A. R. Jameson; A. B. Kostinski

2010-06-01T23:59:59.000Z

395

Processing and Interpretation of Coherent Dual-Polarized Radar Measurements  

Science Conference Proceedings (OSTI)

Dual-polarized coherent radar measurements are used to estimate the differential propagation phase or DP between horizontal and vertical polarization states. The slope of DP is an estimate of the specific differential phase KDP. This process is ...

J. Hubbert; V. Chandrasekar; V. N. Bringi; P. Meischner

1993-04-01T23:59:59.000Z

396

Cloud Ice Crystal Classification Using a 95-GHz Polarimetric Radar  

Science Conference Proceedings (OSTI)

Two algorithms are presented for ice crystal classification using 95-GHz polarimetric radar observables and air temperature (T). Both are based on a fuzzy logic scheme. Ice crystals are classified as columnar crystals (CC), planar crystals (PC), ...

K. Aydin; J. Singh

2004-11-01T23:59:59.000Z

397

The Window Probability Matching Method for Rainfall Measurements with Radar  

Science Conference Proceedings (OSTI)

A simplified probability matching method is introduced that relies on matching the unconditional probabilities of R and Ze, using data from a C-band radar and raingage network near Darwin, Australia. This is achieved by matching raingage ...

Daniel Rosenfeld; David B. Wolff; Eyal Amitai

1994-06-01T23:59:59.000Z

398

Enclosing Shapes for Single-Doppler Radar Features  

Science Conference Proceedings (OSTI)

The primary function of the Terminal Doppler Weather Radar (TDWR) system is to issue microburst alerts when a microburst hazard endangers aircraft. The steps of the algorithm process include 1) determining that a microburst hazard is present, and ...

F. W. Wilson Jr.; R. K. Goodrich; K. Brislawn

1992-04-01T23:59:59.000Z

399

Least Squares Reconstruction of Doppler Radar Spectra for Irregular PRT  

Science Conference Proceedings (OSTI)

A least squares method for the reconstruction of Doppler spectra of weather radars with irregular pulse repetition time used to increase the range of unambiguous velocity is presented and evaluated. This method is a robust spectral method that is ...

John Kalogiros

2012-12-01T23:59:59.000Z

400

A Model for Probability Nowcasts of Accumulated Precipitation Using Radar  

Science Conference Proceedings (OSTI)

A new model for making probability forecasts of accumulated spot precipitation from weather radar data is presented. The model selects a source region upwind of the forecast spot. All pixels (horizontal size 2 × 2 km2) within the source region ...

Tage Andersson; Karl-Ivar Ivarsson

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Estimation of Cloud Content by W-Band Radar  

Science Conference Proceedings (OSTI)

W-band (3.2-mm) radars are seeing increasing utilization as a result of improving microwave technologies and the increased research emphasis being given to nonprecipitating clouds. This niche is exemplified by the study of the radiatively ...

Kenneth Sassen; Liang Liao

1996-06-01T23:59:59.000Z

402

Agile-Beam Phased Array Radar for Weather Observations  

Science Conference Proceedings (OSTI)

Weather radars with conventional antenna cannot provide desired volume scan updates at intervals of one minute or less, which is essential for significant improvement in warning lead time of impending storm hazards. The agile-beam multimission ...

D. S. Zrnic; J. F. Kimpel; D. E. Forsyth; A. Shapiro; G. Crain; R. Ferek; J. Heimmer; W. Benner; T. J. McNellis; R. J. Vogt

2007-11-01T23:59:59.000Z

403

Guard Rail Detection Using Radar and Vision Data Fusion  

E-Print Network (OSTI)

This paper describes a method for detecting guard rails fusing radar and vision data in order to improve and speed-up vehicle detection algorithms. The method is based on the search for uninterrupted oblique lines that cross an interest area. The interest area is dinamically indicated by a radar sensor. A method to manage overlapping areas is also described. The method's efficiency, both in terms of time saving and correct detection rate, is numerically shown.

For Vehicle Detection; Alberto Broggi; Pietro Cerri; Fabio Oleari; Marco Paterlini

2005-01-01T23:59:59.000Z

404

Numerical simulations of oblique penetration into reinforced concrete targets  

Science Conference Proceedings (OSTI)

A dynamic constitutive model based on the tensile and the compressive damage models for concrete was developed and implemented into the three-dimensional finite element code, LS-DYNA. Numerical simulations of oblique penetration into reinforced concrete ... Keywords: Dynamic damage model, Numerical simulation, Oblique penetration, Reinforced concrete

Yan Liu; Fenglei Huang; Aie Ma

2011-04-01T23:59:59.000Z

405

Absolute Calibration of Radar Reflectivity Using Redundancy of the Polarization Observations and Implied Constraints on Drop Shapes  

Science Conference Proceedings (OSTI)

A major limitation of improved radar-based rainfall estimation is accurate calibration of radar reflectivity. In this paper, the authors fully automate a polarimetric method that uses the consistency between radar reflectivity, differential ...

Jonathan J. Gourley; Anthony J. Illingworth; Pierre Tabary

2009-04-01T23:59:59.000Z

406

Constructing Three-Dimensional Multiple-Radar Reflectivity Mosaics: Examples of Convective Storms and Stratiform Rain Echoes  

Science Conference Proceedings (OSTI)

The advent of Internet-2 and effective data compression techniques facilitates the economic transmission of base-level radar data from the Weather Surveillance Radar-1988 Doppler (WSR-88D) network to users in real time. The native radar spherical ...

Jian Zhang; Kenneth Howard; J. J. Gourley

2005-01-01T23:59:59.000Z

407

Impact of CASA Radar and Oklahoma Mesonet Data Assimilation on the Analysis and Prediction of Tornadic Mesovortices in an MCS  

Science Conference Proceedings (OSTI)

The impact of radar and Oklahoma Mesonet data assimilation on the prediction of mesovortices in a tornadic mesoscale convective system (MCS) is examined. The radar data come from the operational Weather Surveillance Radar-1988 Doppler (WSR-88D) ...

Alexander D. Schenkman; Ming Xue; Alan Shapiro; Keith Brewster; Jidong Gao

2011-11-01T23:59:59.000Z

408

ASSIMILATION OF DOPPLER RADAR DATA INTO NUMERICAL WEATHER MODELS  

Science Conference Proceedings (OSTI)

During the year 2008, the United States National Weather Service (NWS) completed an eight fold increase in sampling capability for weather radars to 250 m resolution. This increase is expected to improve warning lead times by detecting small scale features sooner with increased reliability; however, current NWS operational model domains utilize grid spacing an order of magnitude larger than the radar data resolution, and therefore the added resolution of radar data is not fully exploited. The assimilation of radar reflectivity and velocity data into high resolution numerical weather model forecasts where grid spacing is comparable to the radar data resolution was investigated under a Laboratory Directed Research and Development (LDRD) 'quick hit' grant to determine the impact of improved data resolution on model predictions with specific initial proof of concept application to daily Savannah River Site operations and emergency response. Development of software to process NWS radar reflectivity and radial velocity data was undertaken for assimilation of observations into numerical models. Data values within the radar data volume undergo automated quality control (QC) analysis routines developed in support of this project to eliminate empty/missing data points, decrease anomalous propagation values, and determine error thresholds by utilizing the calculated variances among data values. The Weather Research and Forecasting model (WRF) three dimensional variational data assimilation package (WRF-3DVAR) was used to incorporate the QC'ed radar data into input and boundary conditions. The lack of observational data in the vicinity of SRS available to NWS operational models signifies an important data void where radar observations can provide significant input. These observations greatly enhance the knowledge of storm structures and the environmental conditions which influence their development. As the increase in computational power and availability has made higher resolution real-time model simulations possible, the need to obtain observations to both initialize numerical models and verify their output has become increasingly important. The assimilation of high resolution radar observations therefore provides a vital component in the development and utility of numerical model forecasts for both weather forecasting and contaminant transport, including future opportunities to improve wet deposition computations explicitly.

Chiswell, S.; Buckley, R.

2009-01-15T23:59:59.000Z

409

Rainfall Estimation from Polarimetric Radar Measurements: Composite Algorithms Immune to Variability in Raindrop Shape–Size Relation  

Science Conference Proceedings (OSTI)

Polarization diversity radar measurements such as reflectivity factor, differential reflectivity, and differential propagation phase are extensively used in rainfall estimation. Algorithms to estimate rainfall from polarimetric radar measurements ...

Eugenio Gorgucci; Gianfranco Scarchilli; V. Chandrasekar; V. N. Bringi

2001-11-01T23:59:59.000Z

410

Ground potential rise monitor  

SciTech Connect

A device and method for detecting ground potential rise (GPR) comprising positioning a first electrode and a second electrode at a distance from each other into the earth. The voltage of the first electrode and second electrode is attenuated by an attenuation factor creating an attenuated voltage. The true RMS voltage of the attenuated voltage is determined creating an attenuated true RMS voltage. The attenuated true RMS voltage is then multiplied by the attenuation factor creating a calculated true RMS voltage. If the calculated true RMS voltage is greater than a first predetermined voltage threshold, a first alarm is enabled at a local location. If user input is received at a remote location acknowledging the first alarm, a first alarm acknowledgment signal is transmitted. The first alarm acknowledgment signal is then received at which time the first alarm is disabled.

Allen, Zachery W. (Mandan, ND); Zevenbergen, Gary A. (Arvada, CO)

2012-04-03T23:59:59.000Z

411

Ground Water Management Regulations (Louisiana) | Department...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Ground Water Management Regulations (Louisiana) Ground Water Management Regulations (Louisiana) Eligibility Agricultural Construction Developer Fuel Distributor Industrial...

412

Market penetration of biodiesel and ethanol  

E-Print Network (OSTI)

This dissertation examines the influence that economic and technological factors have on the penetration of biodiesel and ethanol into the transportation fuels market. This dissertation focuses on four aspects. The first involves the influence of fossil fuel prices, because biofuels are substitutes and have to compete in price. The second involves biofuel manufacturing technology, principally the feedstock-to-biofuel conversion rates, and the biofuel manufacturing costs. The third involves prices for greenhouse gas offsets. The fourth involves the agricultural commodity markets for feedstocks, and biofuel byproducts. This dissertation uses the Forest and Agricultural Sector Optimization Model-Greenhouse Gas (FASOM-GHG) to quantitatively examine these issues and calculates equilibrium prices and quantities, given market interactions, fossil fuel prices, carbon dioxide equivalent prices, government biofuel subsidies, technological improvement, and crop yield gains. The results indicate that for the ranges studied, gasoline prices have a major impact on aggregate ethanol production but only at low prices. At higher prices, one runs into a capacity constraint that limits expansion on the capacity of ethanol production. Aggregate biodiesel production is highly responsive to gasoline prices and increases over time. (Diesel fuel price is proportional to the gasoline price). Carbon dioxide equivalent prices expand the biodiesel industry, but have no impact on ethanol aggregate production when gasoline prices are high again because of refinery capacity expansion. Improvement of crop yields shows a similar pattern, expanding ethanol production when the gasoline price is low and expanding biodiesel. Technological improvement, where biorefinery production costs decrease over time, had minimal impact on aggregate ethanol and biodiesel production. Finally, U.S. government subsidies have a large expansionary impact on aggregate biodiesel production, but only expand the ethanol industry at low gasoline prices. All of these factors increase agricultural welfare with most expanding producer surplus and mixed effects on consumers.

Szulczyk, Kenneth Ray

2003-05-01T23:59:59.000Z

413

Penetration of the LCLS Injector Shield Wall at Sector 20  

SciTech Connect

Penetrations through the LCLS injector shield wall are needed for the alignment of the accelerator, a diagnostic laser beam and utilities, and are shown in figure 1. The 1-inch diameter LCLS injector beam tube is blocked by the PPS stopper when the injector side of the wall is occupied. The two 3-inch diameter penetrations above and to the left of the beam tube are used by Precision Alignment and will be open only during installation of the injector beamline. Additional 3-inch diameter penetrations are for laser beams which will be used for electron beam diagnostics. These will not be plugged when the injector occupied. Other penetrations for the RF waveguide and other utilities are approximately 13-inch from the floor and as such are far from the line-of-sight of any radiation sources. The waveguide and utility penetrations pass only through the thicker wall as shown in the figure. The principal issue is with the two laser penetrations, since these will be open when the linac is operating and people are in the LCLS injector area. A principal concern is radiation streaming through the penetrations due to direct line-of sight of the PEP-2 lines. To answer this, fans of rays were traced through the 3-inch diameter laser penetrations as shown in Figures 2 and 3. Figure 2 gives the top view of the shield walls, the main linac and PEP-2 lines, and the ray-fans. The fans appear to originate between the walls since their angular envelope is defined by the greatest angle possible when rays are just on the 3-inch diameter at the inner most and outermost wall surfaces. The crossovers of all possible rays lie half way between these two surfaces. As the end-on view of Figure 3 clearly shows, there is no direct line-of-sight through the laser penetrations of the PEP-2 or linac beamlines.

Dowell, D

2010-12-10T23:59:59.000Z

414

Simulation of Armor Penetration by Tungsten Rods: ALEGRA Validation Report  

E-Print Network (OSTI)

Results from simulations of the impact and penetration of tungsten alloy rods into thick rolled armor plates are presented. The calculations were performed with the CTH and ALEGRA computer codes using the DOE massively parallel TFLOPS computer co-developed by Sandia National Laboratory and Intel Corporation. Comparisons with experimental results are presented. Agreement of the two codes with each other and with the empirical results for penetration channel depth and radius is very close. Other shock physics and penetration features are also compared to simulation results. Distribution Category UC-705 ii Intentionally Left Blank iii Contents List of Figures ....................................................................................................... p. iv List of Tables ..........................................................................................................p. v Executive Summary ..............................................................................

Daniel E. Carroll; Eugene S. Hertel, Jr.; Timothy G. Trucano; Category Uc

1997-01-01T23:59:59.000Z

415

Aerosol penetration through a seismically loaded shear wall  

SciTech Connect

An experimental study was performed to measure the aerosol penetration through a reinforced concrete shear wall after simulated seismic damage. Static load-cycle testing, to stress levels sufficient to induce visible shear cracking, was used to simulate the earthquake loading. Air permeability tests were performed both before and after the simulated seismic loading damaged the structure. Aerosol penetration measurements were conducted on the cracked shear wall structure using 0.10 {mu}m monodisperse particles. The measured aerosol number penetration through the cracked shear wall was 0.5%. 7 refs.

Farrar, C.R.; Girrens, S.P.

1992-01-01T23:59:59.000Z

416

Aerosol penetration through a seismically loaded shear wall  

SciTech Connect

An experimental study was performed to measure the aerosol penetration through a reinforced concrete shear wall after simulated seismic damage. Static load-cycle testing, to stress levels sufficient to induce visible shear cracking, was used to simulate the earthquake loading. Air permeability tests were performed both before and after the simulated seismic loading damaged the structure. Aerosol penetration measurements were conducted on the cracked shear wall structure using 0.10 {mu}m monodisperse particles. The measured aerosol number penetration through the cracked shear wall was 0.5%. 7 refs.

Farrar, C.R.; Girrens, S.P.

1992-05-01T23:59:59.000Z

417

Simulation of armor penetration by tungsten rods: ALEGRA validation report  

Science Conference Proceedings (OSTI)

Results from simulations of the impact and penetration of tungsten alloy rods into thick rolled armor plates are presented. The calculations were performed with the CTH and ALEGRA computer codes using the DOE massively parallel TFLOPS computer co-developed by Sandia National Laboratory and Intel Corporation. Comparisons with experimental results are presented. Agreement of the two codes with each other and with the empirical results for penetration channel depth and radius is very close. Other shock physics and penetration features are also compared to simulation results.

Carroll, D.E.; Hertel, E.S. Jr.; Trucano, T.G.

1997-11-01T23:59:59.000Z

418

A VAD-Based Dealiasing Method for Radar Velocity Data Quality Control  

Science Conference Proceedings (OSTI)

This paper describes a new velocity–azimuth display (VAD)-based dealiasing method developed for automated radar radial velocity data quality control to satisfy the high-quality standard and efficiency required by operational radar data ...

Qin Xu; Kang Nai; Li Wei; Pengfei Zhang; Shun Liu; David Parrish

2011-01-01T23:59:59.000Z

419

Effects of Nonuniform Beam Filling on Rainfall Retrieval for the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission (TRMM) will carry the first spaceborne radar for rainfall observation. Because the TRMM Precipitation Radar (PR) footprint size of 4.3 km is greater than the scale of some convective rainfall events, there ...

S. L. Durden; Z. S. Haddad; A. Kitiyakara; F. K. Li

1998-06-01T23:59:59.000Z

420

The Influence of Airborne Doppler Radar Data Quality on Numerical Simulations of a Tropical Cyclone  

Science Conference Proceedings (OSTI)

The impact of airborne Doppler radar data assimilation on improving numerical simulations of tropical cyclones (TCs) has been well recognized. However, the influence of radar data quality on the numerical simulation of tropical cyclones has not ...

Lei Zhang; Zhaoxia Pu; Wen-Chau Lee; Qingyun Zhao

2012-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

An Application of Linear Programming to Polarimetric Radar Differential Phase Processing  

Science Conference Proceedings (OSTI)

Differential phase and its range derivative KDP are of interest to several hydrological applications from weather radar systems. Despite the attractive qualities of polarimetric differential phase measurements, the usefulness of these radar ...

Scott E. Giangrande; Robert McGraw; Lei Lei

2013-08-01T23:59:59.000Z

422

Combination of Manually Digitized Radar and GOES IR for Real-Time Display of Rainfall Intensity  

Science Conference Proceedings (OSTI)

Manually Digitized Radar (MDR) and Geostationary Operational Environmental Satellite (GOES) thermal infrared (IR) data were merged to form a higher-resolution radar/IR product than that represented by the MDR. The combination MDR/IR maps were ...

Paul H. Heinemann; J. David Martsolf; John F. Gerber; Daniel L. Smith

1987-08-01T23:59:59.000Z

423

Radar Echo Structure, Air Motion and Hail Formation in a Large Stationary Multicellular Thunderstorm  

Science Conference Proceedings (OSTI)

Observations from aircraft, Doppler radars, surface mesonetwork, upper air network and surveillance radar are used to describe the structure and evolution of a large rain and hailstorm that occurred on 22 June 1976 in northeastern Colorado. In ...

L. J. Miller; J. C. Fankhauser

1983-10-01T23:59:59.000Z

424

Visual Cloud Histories Related to First Radar Echo Formation in Northeast Colorado Cumulus  

Science Conference Proceedings (OSTI)

Using quantitative analysis of time-lapse motion pictures from aircraft and a sensitive meteorological radar, the cloud top history is related to the early radar echo development in 12 vigorous, summer, convective cloud turrets in northeastern ...

Charles A. Knight; William D. Hall; Philip M. Roskowski

1983-06-01T23:59:59.000Z

425

Experiments in Rainfall Estimation with a Polarimetric Radar in a Subtropical Environment  

Science Conference Proceedings (OSTI)

A unique dataset consisting of high-resolution polarimetric radar measurements and dense rain gauge and disdrometer observations collected in east-central Florida during the summer of 1998 was examined. Comparison of the radar measurements and ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2002-06-01T23:59:59.000Z

426

Enhanced Radar Backscattering due to Oriented Ice Particles at 95 GHz during StormVEx  

Science Conference Proceedings (OSTI)

Nonspherical atmospheric ice particles can enhance radar backscattering and attenuation above that expected from spheres of the same mass. An analysis of scanning 95 GHz radar data collected during the Storm Peak Laboratory cloud property ...

Roger Marchand; Gerald G. Mace; A. Gannet Hallar; Ian B. McCubbin; Sergey Y. Matrosov; Matthew D. Shupe

427

Meteorological and Astronomical Influences on Radar Reflectivity in the Convective Boundary Layer  

Science Conference Proceedings (OSTI)

Observations are presented of time-varying radar reflectivity during a partial solar eclipse in Oklahoma. The measurements from a radar of 10-cm wavelength, were obtained in the clear-air boundary layer. The reflectivity changes closely follow ...

Robert M. Rabin; Richard J. Doviak

1989-11-01T23:59:59.000Z

428

Multifunction Phased-Array Radar: Time Balance Scheduler for Adaptive Weather Sensing  

Science Conference Proceedings (OSTI)

Phased-array radars (PARs) have the capability of instantaneously and dynamically controlling beam position on a pulse-by-pulse basis, which allows a single radar to perform multiple functions, such as tracking multiple storms or weather and ...

Ricardo Reinoso-Rondinel; Tian-You Yu; Sebastián Torres

2010-11-01T23:59:59.000Z

429

Polarimetric Radar Analysis of Raindrop Size Variability in Maritime and Continental Clouds  

Science Conference Proceedings (OSTI)

During the Queensland Cloud Seeding Research Program, the “CP2” polarimetric radar parameter differential radar reflectivity Zdr was used to examine the raindrop size evolution in both maritime and continental clouds. The focus of this paper is to ...

James W. Wilson; Charles A. Knight; Sarah A. Tessendorf; Courtney Weeks

2011-09-01T23:59:59.000Z

430

The ELDORA/ASTRAIA Airborne Doppler Weather Radar: High-Resolution Observations from TOGA COARE  

Science Conference Proceedings (OSTI)

The ELDORA/ASTRAIA (Electra Doppler Radar/Analyese Stereoscopic par Impulsions Aeroporte) airborne Doppler weather radar was recently placed in service by the National Center for Atmospheric Research and the Centre d'étude des Environnements ...

Peter H. Hildebrand; Wen-Chau Lee; Craig A. Walther; Charles Frush; Mitchell Randall; Eric Loew; Richard Neitzel; Richard Parsons; Jacques Testud; François Baudin; Alain LeCornec

1996-02-01T23:59:59.000Z

431

A Doppler Radar Emulator with an Application to the Detectability of Tornadic Signatures  

Science Conference Proceedings (OSTI)

A Doppler radar emulator was developed to simulate the expected mean returns from scanning radar, including pulse-to-pulse variability associated with changes in viewing angle and atmospheric structure. Based on the user’s configuration, the ...

Ryan M. May; Michael I. Biggerstaff; Ming Xue

2007-12-01T23:59:59.000Z

432

Doppler-Radar Measurements of Clear Air Atmospheric Turbulence at 1290 MHz  

Science Conference Proceedings (OSTI)

We present Doppler-radar observations for the refractivity turbulence structure constant CN2 obtained with the Chatanika Radar Facility, near Fairbanks, Alaska, during a 7-day observing period in October 1976.

Ben Balsley; Vern L. Peterson

1981-03-01T23:59:59.000Z

433

Objective Optimization of Weather Radar Networks for Low-Level Coverage Using a Genetic Algorithm  

Science Conference Proceedings (OSTI)

The current Weather Surveillance Radar-1988 Doppler (WSR-88D) radar network is approaching 20 years of age, leading researchers to begin exploring new opportunities for a next-generation network in the United States. With a vast list of ...

James M. Kurdzo; Robert D. Palmer

2012-06-01T23:59:59.000Z

434

The Joint Polarization Experiment: Polarimetric Radar in Forecasting and Warning Decision Making  

Science Conference Proceedings (OSTI)

To test the utility and added value of polarimetric radar products in an operational environment, data from the Norman, Oklahoma (KOUN), polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) were delivered to the National Weather Service ...

Kevin A. Scharfenberg; Daniel J. Miller; Terry J. Schuur; Paul T. Schlatter; Scott E. Giangrande; Valery M. Melnikov; Donald W. Burgess; David L. Andra Jr.; Michael P. Foster; John M. Krause

2005-10-01T23:59:59.000Z

435

An Evaluation of a Drop Distribution–Based Polarimetric Radar Rainfall Estimator  

Science Conference Proceedings (OSTI)

A method for estimating the governing parameters of gamma drop size distributions (DSDs) and associated rainfall rates from polarimetric radar measurements at the S band is examined. The technique uses radar reflectivity at horizontal ...

Edward A. Brandes; Guifu Zhang; J. Vivekanandan

2003-05-01T23:59:59.000Z

436

Three Methods to Determine Profiles of Reflectivity from Volumetric Radar Data to Correct Precipitation Estimates  

Science Conference Proceedings (OSTI)

The vertical variability of radar reflectivity reduces the reliability of precipitation estimation by radar, especially in complex orography. This important source of error can, at least partially, be corrected for, if the vertical profile of ...

Bertrand Vignal; Gianmario Galli; Jürg Joss; Urs Germann

2000-10-01T23:59:59.000Z

437

Simultaneous Measurement of Ocean Winds and Waves with an Airborne Coherent Real Aperture Radar  

Science Conference Proceedings (OSTI)

A coherent, X-band airborne radar has been developed to measure wind speed and direction simultaneously with directional wave spectra on the ocean. The coherent real aperture radar (CORAR) measures received power, mean Doppler shifts, and mean ...

William J. Plant; William C. Keller; Kenneth Hayes

2005-07-01T23:59:59.000Z

438

Predictability of Precipitation from Continental Radar Images. Part IV: Limits to Prediction  

Science Conference Proceedings (OSTI)

Predictability of precipitation is examined from storm to synoptic scales through an experimental approach using continent-scale radar composite images. The lifetime of radar reflectivity patterns in Eulerian and Lagrangian coordinates is taken ...

Urs Germann; Isztar Zawadzki; Barry Turner

2006-08-01T23:59:59.000Z

439

Design and Deployment of a Portable, Pencil-Beam, Pulsed, 3-cm Doppler Radar  

Science Conference Proceedings (OSTI)

A portable, pencil-beam, pulsed, Doppler, 3-cm wavelength radar has been constructed to study a wide variety of meteorological phenomena including tornadoes, severe storms, and boundary layer processes. The new radar, the Doppler on Wheels (DOW), ...

Joshua Wurman; Jerry Straka; Erik Rasmussen; Mitch Randall; Allen Zahrai

1997-12-01T23:59:59.000Z

440

CSU-CHILL Polarimetric Radar Measurements from a Severe Hail Storm in Eastern Colorado  

Science Conference Proceedings (OSTI)

Polarimetric radar measurements made by the recently upgraded CSU-CHILL radar system in a severe hailstorm are analyzed permitting for the first time the combined use of Zh, ZDR, linear depolarization ratio (LDR), KDP, and ?h? to infer ...

J. Hubbert; V. N. Bringi; L. D. Carey; S. Bolen

1998-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

First Radar Echoes and the Early ZDR History of Florida Cumulus  

Science Conference Proceedings (OSTI)

The early histories of radar echo and polarization differential reflectivity (ZDR) from growing cumulus clouds observed in Florida with a 10-cm-wavelength radar are reported in detail. Raindrops 1 to several millimeters in diameter are present at ...

Charles A. Knight; Jothiram Vivekanandan; Sonia G. Lasher-Trapp

2002-05-01T23:59:59.000Z

442

A Radar-Based Climatology of Thunderstorm Days across New York State  

Science Conference Proceedings (OSTI)

Archived radar reports, derived from the National Weather Service radar network, were used to estimate the average annual frequencies of thunderstorm days across New York State for the period 1978–81. The archival records consist of manually-...

Phillip D. Falconer

1984-07-01T23:59:59.000Z

443

Lightning Activity in a Hail-Producing Storm Observed with Phased-Array Radar  

Science Conference Proceedings (OSTI)

This study examined lightning activity relative to the rapidly evolving kinematics of a hail-producing storm on 15 August 2006. Data were provided by the National Weather Radar Testbed Phased-Array Radar, the Oklahoma Lightning Mapping Array, and ...

C. Emersic; P. L. Heinselman; D. R. MacGorman; E. C. Bruning

2011-06-01T23:59:59.000Z

444

The Vertical Structure of TOGA COARE Convection. Part I: Radar Echo Distributions  

Science Conference Proceedings (OSTI)

Radar data collected by the 5-cm MIT radar, which was deployed aboard the R/V Vickers during the intensive observing period of the Tropical Ocean Global Atmosphere Coupled Ocean–Atmosphere Response Experiment, are partitioned into convective and ...

Charlotte A. DeMott; Steven A. Rutledge

1998-09-01T23:59:59.000Z

445

Derivation of a 10-Year Radar-Based Climatology of Rainfall  

Science Conference Proceedings (OSTI)

Weather radars give quantitative precipitation estimates over large areas with high spatial and temporal resolutions not achieved by conventional rain gauge networks. Therefore, the derivation and analysis of a radar-based precipitation “...

Aart Overeem; Iwan Holleman; Adri Buishand

2009-07-01T23:59:59.000Z

446

Preliminary Results from Multiparameter Airborne Rain Radar Measurement in the Western Pacific  

Science Conference Proceedings (OSTI)

Preliminary results are presented from multiparameter airborne radar measurements of tropical storms. The experiment was conducted in the western Pacific in September 1990 with the NASA DC-8 aircraft that was equipped with a dual-wavelength radar ...

Hiroshi Kumagai; Robert Meneghini; Toshiaki Kozu

1993-02-01T23:59:59.000Z

447

Analysis and Interpretation of Dual-Polarized Radar Measurements at +45° and ?45° Linear Polarization States  

Science Conference Proceedings (OSTI)

Equations are derived for transforming radar data obtained with ±45° linear polarization states to conventional radar parameters measured at horizontal and vertical polarization states. The derivation is based on the covariance matrix and assumes ...

V. Chandrasekar; J. Hubbert; V. N. Bringi; P. F. Meischner

1994-04-01T23:59:59.000Z

448

Continuous Humidity Monitoring in a Tropical Region with the Equatorial Atmosphere Radar  

Science Conference Proceedings (OSTI)

A radar remote sensing technique that estimates humidity profiles using a wind profiler is applied to the equatorial atmosphere radar (EAR) to monitor detailed humidity variations in tropical regions. Turbulence echo power intensity is related to ...

Jun-ichi Furumoto; Toshitaka Tsuda; Satoshi Iwai; Toshiaki Kozu

2006-04-01T23:59:59.000Z

449

Dealiasing Doppler Velocities Measured by a Bistatic Radar Network during a Downburst-Producing Thunderstorm  

Science Conference Proceedings (OSTI)

The object of this paper was to develop an automated dealiasing scheme that dealiases Doppler velocities measured by a bistatic Doppler radar network. The particular network consists of the C-band polarimetric diversity Doppler radar, POLDIRAD, ...

Katja Friedrich; Olivier Caumont

2004-05-01T23:59:59.000Z

450

Incoherent scatter radar detection of enhanced plasma line in ionospheric E-region over Arecibo  

E-Print Network (OSTI)

A series of incoherent scatter radar (ISR) observation were conducted at the Arecibo Observatory from December 27, 2005 until January 3, 2006. From plasma line measurements that were taken during this radar campaign, we ...

Pradipta, Rezy

2006-01-01T23:59:59.000Z

451

Radar Reflectivity-Ice Water Content Relationships for Use above the Melting Level in Hurricanes  

Science Conference Proceedings (OSTI)

Regression equations linking radar reflectivity (Ze) and ice water content (IWC) were calculated from airborne radar and particle image data that were collected above the melting level in two hurricanes. The Ze ? IWC equation from the stratiform ...

Robert A. Black

1990-09-01T23:59:59.000Z

452

Rainfall Parameter Estimation from Dual-Radar Measurements Combining Reflectivity Profile and Path-integrated Attenuation  

Science Conference Proceedings (OSTI)

Rain rate estimation properties of multiparameter radar measurements combining radar reflectivity and microwave attenuations are studied through simulations using a two-year disdrometer dataset. In the first simulation, properties of “complete” ...

Toshiaki Kozu; Kenji Nakamura

1991-04-01T23:59:59.000Z

453

Biases of Rain Retrieval Algorithms for Spaceborne Radar Caused by Nonuniformity of Rain  

Science Conference Proceedings (OSTI)

The biases of various rain retrieval algorithms for a spaceborne rain radar due to nonuniformity of rain are studied using simple models and an actual time sequence of rainfall rate. A conventional rain retrieval algorithm in which measured radar ...

Kenji Nakamura

1991-06-01T23:59:59.000Z

454

Study of Polarization Differences in Ku-Band Ocean Radar Imagery  

Science Conference Proceedings (OSTI)

Radar returns from the sea surface can be represented as the sum of two contributions from Bragg scattering and from individual breaking events. This representation is used to analyze polarimetric radar images of ocean areas obtained at grazing ...

Andre V. Smirnov; Valery U. Zavorotny

1995-10-01T23:59:59.000Z

455

The Transition from the Present Radar Dissemination System to the NEXRAD Information Dissemination Service (NIDS)  

Science Conference Proceedings (OSTI)

The National Weather Service (NWS) will begin replacing its current system of weather radars with Next Generation Weather Radars (NEXRAD) in late 1990. Presented is an overview of previous and current systems, and the replacement NEXRAD ...

Vico E. Baer

1991-01-01T23:59:59.000Z

456

The Genesis of Three Nonsupercell Tornadoes Observed with Dual-Doppler Radar  

Science Conference Proceedings (OSTI)

Dual-Doppler radar analyses of three tornadoes associated with a multicellular line of storms are presented. The F2–F3 intensity tornadoes occurred on 15 June 1988 near Denver, Colorado, during the Terminal Doppler Weather Radar (TDWR) Project. ...

Rita D. Roberts; James W. Wilson

1995-12-01T23:59:59.000Z

457

Documenting Storm Severity in the Mid-Atlantic Region Using Lightning and Radar Information  

Science Conference Proceedings (OSTI)

Storm severity in the mid-Atlantic region of the United States is examined using lightning, radar, and model-derived information. Automated Warning Decision Support System (WDSS) procedures are developed to create grids of lightning and radar ...

Scott D. Rudlosky; Henry E. Fuelberg

2013-09-01T23:59:59.000Z

458

An Application of Linear Programming to Polarimetric Radar Differential Phase Processing  

Science Conference Proceedings (OSTI)

Differential phase and its range derivative KDP are of interest to several hydrological applications from weather radar systems. Despite the attractive qualities of polarimetric differential phase measurements, the usefulness of these radar ...

Scott E. Giangrande; Robert McGraw; Lei Lei

459

Observations of the Small-Scale Variability of Precipitation Using an Imaging Radar  

Science Conference Proceedings (OSTI)

For many years, spatial and temporal inhomogeneities in precipitation fields have been studied using scanning radars, cloud radars, and disdrometers, for example. Each measurement technique has its own advantages and disadvantages. Conventional ...

Robert D. Palmer; Boon Leng Cheong; Michael W. Hoffman; Stephen J. Frasier; F. J. López-Dekker

2005-08-01T23:59:59.000Z

460

Vertical Structure of Hurricane Eyewalls as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Statistical analysis of the vertical structure of radar echoes in the eyewalls of tropical cyclones, shown by the Tropical Rainfall Measurement Mission (TRMM) Precipitation Radar (PR), shows that the eyewall contains high reflectivities and high ...

Deanna A. Hence; Robert A. Houze Jr.

2011-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar  

Science Conference Proceedings (OSTI)

Ten years of data from the Tropical Rainfall Measurement Mission satellite’s Precipitation Radar (TRMM PR) show the vertical structure of tropical cyclone rainbands. Radar-echo statistics show that rainbands have a two-layered structure, with ...

Deanna A. Hence; Robert A. Houze Jr.

2012-09-01T23:59:59.000Z

462

A Study of Thunderstorm Microphysics with Multiparameter Radar and Aircraft Observations  

Science Conference Proceedings (OSTI)

Excellent agreement was found between multiparameter radar signatures of hail, raindrops, and mixed-phase precipitation and in situ precipitation particle measurements made by aircraft in a northeastern Colorado hail-storm. Radar reflectivity ...

E. A. Brandes; J. Vivekanandan; J. D. Tuttle; C. J. Kessinger

1995-11-01T23:59:59.000Z

463

A Variational Scheme for Retrieving Rainfall Rate and Hail Reflectivity Fraction from Polarization Radar  

Science Conference Proceedings (OSTI)

Polarization radar offers the promise of much more accurate rainfall-rate R estimates than are possible from radar reflectivity factor Z alone, not only by better characterization of the drop size distribution, but also by more reliable ...

Robin J. Hogan

2007-10-01T23:59:59.000Z

464

The Measurement of Doppler Wind Fields with Fast Scanning Radars: Signal Processing Techniques  

Science Conference Proceedings (OSTI)

This paper discusses signal processing techniques being developed for making Doppler wind velocity measurements using airport surveillance radars. Techniques are presented and evaluated for velocity estimation using fast-rotating radars. In ...

John R. Anderson

1987-12-01T23:59:59.000Z

465

Potential Role Of Dual- Polarization Radar In The Validation Of Satellite Precipitation Measurements: Rationale and Opportunities  

Science Conference Proceedings (OSTI)

Dual-polarization weather radars have evolved significantly in the last three decades culminating in operational deployment by the National Weather Service. In addition to operational applications in the weather service, dual-polarization radars ...

V. Chandrasekar; V. N. Bringi; S. A. Rutledge; Arthur Hou; Eric Smith; Gail Skofronick Jackson; E. Gorgucci; W. A. Petersen

2008-08-01T23:59:59.000Z

466

Case Studies of the Vertical Velocity Seen by the Flatland Radar Compared with Indirectly Computed Values  

Science Conference Proceedings (OSTI)

The hypothesis that temporal averages of vertical motions over a single radar station are representative of weather systems large enough to be resolved by the radiosonde network is tested using data from the Flatland VHF radar, located in the ...

G. D. Nastrom; W. L. Clark; K. S. Gage; T. E. VanZandt; J. M. Warnock; R. Creasey; P. M. Pauley

1994-02-01T23:59:59.000Z

467

Tropopause Folding and the Variability of the Tropopause Height as Seen by the Flatland VHF Radar  

Science Conference Proceedings (OSTI)

The Flatland radar, a VHF wind profiler located near Urbana, Illinois, has been used to study the variability of the tropopause over the period March 1987–April 1988. The vertically directed radar beam provides an indicator of tropopause height ...

G. D. Nastrom; J. L. Green; K. S. Gage; M. R. Peterson

1989-12-01T23:59:59.000Z

468

Multilag Correlation Estimators for Polarimetric Radar Measurements in the Presence of Noise  

Science Conference Proceedings (OSTI)

The quality of polarimetric radar data degrades as the signal-to-noise ratio (SNR) decreases. This substantially limits the usage of collected polarimetric radar data to high SNR regions. To improve data quality at low SNRs, multilag correlation ...

Lei Lei; Guifu Zhang; Richard J. Doviak; Robert Palmer; Boon Leng Cheong; Ming Xue; Qing Cao; Yinguang Li

2012-06-01T23:59:59.000Z

469

Characteristics of Rainbands, Radar Echoes, and Lightning near the North Carolina Coast during GALE  

Science Conference Proceedings (OSTI)

Characteristics of mesoscale rainbands and echoes in radar reflectivity data recorded during the field phase of the Genesis of Atlantic Lows Experiment (GALE) are presented. The primary sources of data were radar microfilm and manually digitized ...

Peter P. Dodge; Robert W. Burpee

1993-07-01T23:59:59.000Z

470

Radar and Surface Measurement of Rainfall during CaPE: 26 July 1991 Case Study  

Science Conference Proceedings (OSTI)

Conventional usage of multiparameter radar measurements for rainfall estimation has been associated with tracking the variability of the raindrop size distribution. The use of multiparameter radar measurements in a statistical framework to ...

Eugenio Gorgucci; V. Chandrasekar; Gianfranco Scarchilli

1995-07-01T23:59:59.000Z

471

A Wintertime Gulf Coast Squall Line Observed by EDOP Airborne Doppler Radar  

Science Conference Proceedings (OSTI)

An extensive wintertime squall line on 13 January 1995 occurring along the U.S. Gulf of Mexico coastline is examined using airborne radar observations combined with conventional data analysis. Flight tracks with the ER-2 Doppler radar (EDOP) ...

G. M. Heymsfield; J. B. Halverson; I. J. Caylor

1999-12-01T23:59:59.000Z

472

Spatially Variable Advection Correction of Radar Data. Part II: Test Results  

Science Conference Proceedings (OSTI)

The spatially variable advection-correction/analysis procedure introduced in Part I is tested using analytical reflectivity blobs embedded in a solid-body vortex, and Terminal Doppler Weather Radar (TDWR) and Weather Surveillance Radar-1988 ...

Alan Shapiro; Katherine M. Willingham; Corey K. Potvin

2010-11-01T23:59:59.000Z

473

The Influence of Antenna Radome on Weather Radar Calibration and Its Real-Time Assessment  

Science Conference Proceedings (OSTI)

Operational weather radars are usually equipped with a radome to reduce the wind load on the antenna and to allow continuous operation under bad weather conditions. The study is focused on quantifying the impact on radar polarimetric measurements ...

E. Gorgucci; R. Bechini; L. Baldini; R. Cremonini; V. Chandrasekar

2013-04-01T23:59:59.000Z

474

The Turbulence Structure in a Continental Stratocumulus Cloud from Millimeter-Wavelength Radar Observations  

Science Conference Proceedings (OSTI)

The turbulent-scale vertical velocity structure in a continental stratocumulus cloud is studied using a 3-mm wavelength Doppler radar operating in a vertically pointing mode. The radar observations provided 30-m sampling in the vertical with 2-s ...

Pavlos Kollias; Bruce Albrecht

2000-08-01T23:59:59.000Z

475

Attenuation Calibration of an X-Band Weather Radar Using a Microwave Link  

Science Conference Proceedings (OSTI)

The attenuation of a radar signal is a serious problem facing meteorologists and hydrologists. In heavy rain, reflectivity information can be completely lost from large portions of a radar scan. The problem is particularly acute for X-band ...

A. R. Rahimi; A. R. Holt; G. J. G. Upton; S. Krämer; A. Redder; H-R. Verworn

2006-03-01T23:59:59.000Z

476

Prognostic Equation for Radar Radial Velocity Derived by Considering Atmospheric Refraction and Earth Curvature  

Science Conference Proceedings (OSTI)

The prognostic equation for the radial velocity field observed with a Doppler radar is derived to include the effects of atmospheric refraction and earth curvature on radar-beam height and slope angle. The derived equation, called the radial ...

Qin Xu; Li Wei

2013-10-01T23:59:59.000Z

477

Doppler Cloud Radar Derived Drop Size Distributions in Liquid Water Stratus Clouds  

Science Conference Proceedings (OSTI)

A cloud particle size retrieval algorithm that uses radar reflectivity factor and Doppler velocity obtained by a 35-GHz Doppler radar and liquid water path estimated from microwave radiometer radiance measurements is developed to infer the size ...

Seiji Kato; Gerald G. Mace; Eugene E. Clothiaux; James C. Liljegren; Richard T. Austin

2001-10-01T23:59:59.000Z

478

Systematic Variation of Observed Radar Reflectivity–Rainfall Rate Relations in the Tropics  

Science Conference Proceedings (OSTI)

The Tropical Rainfall Measuring Mission Global Validation Program provides a unique opportunity to compare radar datasets from different sites, because they are analyzed in a relatively uniform procedure. Monthly observed radar reflectivity–...

Eyal Amitai

2000-12-01T23:59:59.000Z

479

Attenuation-Based Estimates of Rainfall Rates Aloft with Vertically Pointing Ka-Band Radars  

Science Conference Proceedings (OSTI)

An approach is suggested to retrieve low-resolution rainfall rate profiles and layer-averaged rainfall rates, Ra, from radar reflectivity measurements made by vertically pointing Ka-band radars. This approach is based on the effects of ...

Sergey Y. Matrosov

2005-01-01T23:59:59.000Z

480

Observations of Two Colorado Thunderstorms by Means of a Zenith-Pointing Doppler Radar  

Science Conference Proceedings (OSTI)

A description is given of the distributions of radar reflectivity, mean Doppler velocity, vertical air velocity and Doppler-velocity variance in two thunderstorms over eastern Colorado. A zenith-pointing Doppler radar was used to obtain data at ...

Louis J. Battan

1980-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "ground penetrating radar" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Determining Weather Radar Antenna Pointing Using Signals Detected from the Sun at Low Antenna Elevations  

Science Conference Proceedings (OSTI)

A method to determine the elevation and azimuth biases of the radar antenna using solar signals observed by a scanning radar is presented. Data recorded at low elevation angles where the atmospheric refraction has a significant effect on the ...

Asko Huuskonen; Iwan Holleman

2007-03-01T23:59:59.000Z

482

Oscillations in Mesocyclone Signatures with Range Owing to Azimuthal Radar Sampling  

Science Conference Proceedings (OSTI)

When a thunderstorm mesocyclone changes range relative to a Doppler radar, the deduced core diameter and mean rotational velocity of the Doppler velocity mesocyclone signature oscillate back and forth, even though the radar beam’s physical width ...

Vincent T. Wood; Rodger A. Brown

2000-01-01T23:59:59.000Z

483

Properties of Tropical Convection Observed by Millimeter-Wave Radar Systems  

Science Conference Proceedings (OSTI)

This paper describes the results of analysis of over 825 000 profiles of millimeter-wave radar (MWR) reflectivities primarily collected by zenith-pointing surface radars observing tropical convection associated with various phases of activity of ...

Graeme L. Stephens; Norman B. Wood

2007-03-01T23:59:59.000Z

484

The Impact of Beam Broadening on the Quality of Radar Polarimetric Data  

Science Conference Proceedings (OSTI)

The impact of beam broadening on the quality of radar polarimetric data in the presence of nonuniform beam filling (NBF) is examined both theoretically and experimentally. Cross-beam gradients of radar reflectivity Z, differential reflectivity Z...

Alexander V. Ryzhkov

2007-05-01T23:59:59.000Z

485

Radar Observations of Transport and Diffusion in Clouds and Precipitation Using TRACIR  

Science Conference Proceedings (OSTI)

A remote-sensing technique called TRACIR (tracking air with circular-polarization radar) was developed recently for studying air-parcel trajectories in clouds. The technique uses a dual-circular-polarization radar to detect microwave chaff fibers ...

Brooks E. Martner; Robert A. Kropfli; John D. Marwitz

1992-06-01T23:59:59.000Z

486

The Refractive Index Spectra within Clouds from Forward-Scatter Radar Observations  

Science Conference Proceedings (OSTI)

When long-wavelength radars are used to observe the atmosphere, there are occasions when radar return from a volume of cloud is unexpectedly large relative to that predicted by the classical incoherent scatter from individual cloud droplets. The ...

Earl E. Gossard; Richard G. Strauch

1981-02-01T23:59:59.000Z

487

The Kinetic Energy of Hailfalls. Part III: Sampling Errors Inferred, from Radar Data  

Science Conference Proceedings (OSTI)

The representativeness of hailfall kinetic energies derived from point measurements of networks is studied by means of radar data of hail cells. The 202 cells were observed within a radius of 60 km from the 10 cm radar. Different Cartesian ...

A. Waldvogel; W. Schmid

1982-09-01T23:59:59.000Z

488

An Extended Kalman Filter Framework for Polarimetric X-Band Weather Radar Data Processing  

Science Conference Proceedings (OSTI)

The different quantities measured by dual-polarization radar systems are closely linked to each other. An extended Kalman filter framework is proposed in order to make use of constraints on individual radar observables that are induced by these ...

Marc Schneebeli; Alexis Berne

2012-05-01T23:59:59.000Z

489

Estimating the Vertical Structure of Intense Mediterranean Precipitation Using Two X-Band Weather Radar Systems  

Science Conference Proceedings (OSTI)

The present study aims at a preliminary approach of multiradar compositing applied to the estimation of the vertical structure of precipitation—an important issue for radar rainfall measurement and prediction. During the HYDROMET Integrated Radar ...

A. Berne; G. Delrieu; H. Andrieu

2005-11-01T23:59:59.000Z

490

Detection of Ice Hydrometeor Alignment Using an Airborne W-band Polarimetric Radar  

Science Conference Proceedings (OSTI)

This paper presents airborne W-band polarimetric radar measurements at horizontal and vertical incidence on ice clouds using a 95-GHz radar on the University of Wyoming King Air research aircraft. Coincident, in situ measurements from probes on ...

J. Galloway; A. Pazmany; J. Mead; R. E. McIntosh; D. Leon; J. French; R. Kelly; G. Vali

1997-02-01T23:59:59.000Z

491

Evaluating Radial Current Measurements from CODAR High-Frequency Radars with Moored Current Meters  

Science Conference Proceedings (OSTI)

The performance of a network of five CODAR (Coastal Ocean Dynamics Application Radar) SeaSonde high-frequency (HF) radars, broadcasting near 13 MHz and using the Multiple Signal Classification (MUSIC) algorithm for direction finding, is described ...

Brian M. Emery; Libe Washburn; Jack A. Harlan

2004-08-01T23:59:59.000Z

492

Observations of a Colorado Tornado. Part II: Combined Photogrammetric and Doppler Radar Analysis  

Science Conference Proceedings (OSTI)

An integrated analysis of photographic and Doppler radar observations of a tornadic storm during the Convection Initiation and Downburst Experiment (CINDE) is presented. High-resolution single-Doppler radar measurements are combined with cloud ...

Roger M. Wakimoto; Brooks E. Martner

1992-04-01T23:59:59.000Z

493

Precipitation Observed in Oklahoma Mesoscale Convective Systems with a Polarimetric Radar  

Science Conference Proceedings (OSTI)

In this paper, the fields of three radar polarimetric variables-differential reflectivity ZDR, specific differential phase KDP, and correlation coefficient between horizontally (H) and vertically (V) polarized echoes ?hv-along with radar ...

A. V. Ryzhkov; D. S. Zrni?

1994-04-01T23:59:59.000Z

494

Changes in the Economic Value of Variable Generation at High Penetration Levels: A Pilot Case Study of California  

E-Print Network (OSTI)

TES Avg. DA Wholesale Price PV Penetration (% Annual Load) (Generation Sold at Low Prices PV Penetration (% AnnualTES Avg. DA Wholesale Price PV Penetration (% Annual Load) (

Mills, Andrew

2013-01-01T23:59:59.000Z

495

Design and Performance of Solar Decathlon 2011 High-Penetration Microgrid: Preprint  

DOE Green Energy (OSTI)

The U.S. Department of Energy Solar Decathlon challenges collegiate teams to design, build, and operate solar-powered houses that are cost-effective, energy-efficient, and attractive. The Solar Decathlon 2011 was held in Washington, D.C., from September 23 to October 2, 2011 . A high-penetration microgrid was designed, installed, and operated for the Solar Decathlon 2011 to grid-connect 19 highly energy-efficient, solar-powered competition houses to a single utility connection point. The capacity penetration of this microgrid (defined as maximum PV generation divided by maximum system load over a two-week period) was 74% based on 1-minute averaged data. Temporary, ground-laid conductors and electrical distribution equipment were installed to grid-connect the Solar Decathlon village, which included the houses as well as other electrical loads used by the event organizers. While 16 of the houses were connected to the 60 Hz microgrid, three houses from Belgium, China, and New Zealand were supplied with 50 Hz power. The design of the microgrid, including the connection of the houses powered by 50 Hz and a standby diesel generator, is discussed in this paper. In addition to the utility-supplied net energy meters at each house, a microgrid monitoring system was installed to measure and record energy consumption and PV energy production at 1-second intervals at each house. Bidirectional electronic voltage regulators were installed for groups of competition houses, which held the service voltage at each house to acceptable levels. The design and successful performance of this high-penetration microgrid is presented from the house, microgrid operator, and utility perspectives.

Stafford, B.; Coddington, M.; Butt, R.; Solomon, S.; Wiegand, G.; Wagner, C.; Gonzalez, B.

2012-04-01T23:59:59.000Z

496

A concentration rebound method for measuring particle penetration and  

NLE Websites -- All DOE Office Websites (Extended Search)

A concentration rebound method for measuring particle penetration and A concentration rebound method for measuring particle penetration and deposition in the indoor environment Title A concentration rebound method for measuring particle penetration and deposition in the indoor environment Publication Type Journal Article LBNL Report Number LBNL-51631 Year of Publication 2003 Authors Thatcher, Tracy L., Melissa M. Lunden, Kenneth L. Revzan, Richard G. Sextro, and Nancy J. Brown Journal Aerosol Science & Technology Volume 37 Start Page Chapter Pagination 847-864 Abstract Continuous, size resolved particle measurements were performed in two houses in order to determine size- dependent particle penetration into and deposition in the indoor environment. The experiments consisted of three parts: measurement of the particle loss rate following artificial elevation of indoor particle concentrations,

497

Effects of Penetrative Radiation on the Upper Tropical Ocean Circulation  

Science Conference Proceedings (OSTI)

The effects of penetrative radiation on the upper tropical ocean circulation have been investigated with an ocean general circulation model (OGCM) with attenuation depths derived from remotely sensed ocean color data. The OGCM is a reduced ...

Raghu Murtugudde; James Beauchamp; Charles R. McClain; Marlon Lewis; Antonio J. Busalacchi

2002-03-01T23:59:59.000Z

498

Determining the Adequate Level of Distributed Generation Penetration...  

NLE Websites -- All DOE Office Websites (Extended Search)

Determining the Adequate Level of Distributed Generation Penetration in Future Grids Speaker(s): Johan Driesen Date: March 18, 2004 - 12:00pm Location: Bldg. 90 Seminar HostPoint...

499

Transmission System Performance Analysis for High-Penetration Photovoltaics  

DOE Green Energy (OSTI)

This study is an assessment of the potential impact of high levels of penetration of photovoltaic (PV) generation on transmission systems. The effort used stability simulations of a transmission system with different levels of PV generation and load.

Achilles, S.; Schramm, S.; Bebic, J.

2008-02-01T23:59:59.000Z

500

The Penetration of Mountain Waves into the Middle Atmosphere  

Science Conference Proceedings (OSTI)

A linear nonhydrostatic model of gravity waves forced by a bell-shaped ridge is used to investigate the penetration of mountain waves into the stratosphere and mesosphere during winter and fall. Gravity waves with horizontal scales less than 30 ...

Mark R. Schoeberl

1985-12-01T23:59:59.000Z